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Percentage of cash, cash equivalents and investments threshold used to determine major issuer Percent Of Cash Equivalents And Investments Threshold Used To Determine Major Issuers Percent of cash equivalents and investments threshold used to determine major issuers. 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PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Fair Value Inputs for Debenture - Entity Credit Risk Fair Value Inputs for Debenture - Entity Credit Risk Fair Value Inputs for Debenture - Entity Credit Risk Effective Income Tax Rate Reconciliation, Period Peroid Adjustments, Amount Effective Income Tax Rate Reconciliation, Period Peroid Adjustments, Amount Effective Income Tax Rate Reconciliation, Period Peroid Adjustments, Amount Common Stock, Amount [Roll Forward] Common Stock, Amount [Roll Forward] Common Stock, Amount [Roll Forward] Finance Lease, Weighted Average Discount Rate, Percent Finance Lease, Weighted Average Discount Rate, Percent Interest rate Debt Instrument, Interest Rate, Stated Percentage Text Block [Abstract] Total shareholders' equity Beginning Balance Ending Balance Stockholders' Equity Attributable to Parent Equity, Attributable to Parent Litigation original amount awarded to other party before correction Litigation original amount awarded to other party before correction Litigation original amount awarded to other party before correction Entity Listings, Exchange [Axis] Entity Listings, Exchange [Axis] Assets Assets [Abstract] Government subsidies Government subsidies Government subsidies Accounts Receivable, Allowance for Credit Loss, Relating to Customers Evaluated Separately Accounts Receivable, Allowance for Credit Loss, Relating to Customers Evaluated Separately Accounts Receivable, Allowance for Credit Loss, Relating to Customers Evaluated Separately Total Debt Securities, Available-for-Sale, Amortized Cost Differences in income taxes resulting from: Difference In Income Tax Resulting From [Abstract] Difference in income tax resulting from. 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HHBRP subsidy - % of eligible HHBRP subsidy - % of eligible expenses HHBRP subsidy - % of eligible expenses Other Receivable Other Receivable [Table Text Block] Other Receivable Liabilities held for sale, non-current (note 3) Disposal Group, Including Discontinued Operation, Liabilities, Total Disposal Group, Including Discontinued Operation, Liabilities Ministry of Innovation, Science and Development Canada [Member] Ministry of Innovation, Science and Development Canada [Member] Ministry of Innovation, Science and Development Canada Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Amount of options to vest after 1 Year Amount of options to vest after 1 Year Amount of options to vest after Year 1 Finance Lease, Liability, Noncurrent Finance Lease, Liability, Noncurrent Tax Year 2041 Tax Year 2041 [Member] Tax Year 2041 Provision for Income Taxes from Continuing Operations Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Tax Year 2038 Tax Year 2038 [Member] Tax Year 2038 Option-Pricing Model Assumptions Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] License Revenue Term - BlackBerry Spark License Revenue Term - BlackBerry Cylance License Revenue Term - BlackBerry Cylance Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table Text Block] Capital stock and additional paid-in capital Additional Paid in Capital [Abstract] Debt Securities, Available-for-sale, Unrealized Gain Debt Securities, Available-for-Sale, Unrealized Gain Finance Lease, Liability, Payment, Due, Total Finance Lease, Liability, to be Paid Accumulated Other Comprehensive Loss, End of Period AOCI Attributable to Parent [Member] Income Tax Examination [Line Items] Income Tax Examination [Line Items] All Individuals All Individuals [Member] Disposal Group, Including Discontinued Operation, Accounts Payable Disposal Group, Including Discontinued Operation, Accounts Payable Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue [Table Text Block] After 24 months After 24 months [Member] After 24 months [Domain] Weighted-average vesting period related to unrecognized share-based compensation on unvested awards Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Balance Sheet Related Disclosures [Abstract] Balance Sheet Related Disclosures [Abstract] Statement [Line Items] Statement [Line Items] Total assets Assets Assets Related party principal amounts of 3.75% debenture owned Related Party Principal Amounts of 3.75% Debenture Owned Related Party Principal Amounts of 3.75% Debenture Owned Components of Deferred Income Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] Investment income, net (note 4 and note 7) Investment income, net Investment Income, Net Lease Obligation Incurred Lease Obligation Incurred Tax Year 2042 Tax Year 2042 [Member] Tax Year 2042 Federal tax abatement Federal tax abatement Federal tax abatement Operating Segments Operating Segments [Member] Shares issued: Shares Issued [Abstract] Shares issued. Weighted-average grant date fair value of stock options granted during the periods (usd per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Disposal Group, Including Discontinued Operation, Research and development Disposal Group, Including Discontinued Operation, Research and development Disposal Group, Including Discontinued Operation, Research and development Legal Recoveries Legal Recoveries Legal Recoveries Disposal Group, Including Discontinued Operation, Revenue Disposal Group, Including Discontinued Operation, Revenue Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent No fixed maturity Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value PEO PEO [Member] Concentration Risk % [Axis] Concentration Risk % [Axis] Concentration Risk % Facilities reclass - impact to Cybersecurity Segment cost of sales Facilities reclass - impact to Cybersecurity Segment cost of sales Facilities reclass - impact to Cybersecurity Segment cost of sales Other long-term liabilities Other Liabilities, Noncurrent Goodwill (note 5) Carrying amount as of beginning of period Carrying amount as of end of period Goodwill Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Finance Lease, Liability, Payments, Due after Year Five Finance Lease, Liability, to be Paid, after Year Five Effective Income Tax Rate Reconciliation, Tax Contingency, Amount Effective Income Tax Rate Reconciliation, Tax Contingency, Amount Tax Year 2043 Tax Year 2043 [Member] Tax Year 2043 Retained Earnings (Deficit) [Member] Retained Earnings [Member] Operating lease liabilities Operating Lease, Liability, Noncurrent Total operating expenses Operating Expenses Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common Stock, Shares, Outstanding Capital stock outstanding, Shares, Beginning Balance Capital stock outstanding, Shares, Ending Balance Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Foreign Currency Cumulative Translation Adjustment Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Earnings Per Share, Diluted Earnings Per Share, Diluted Right-of- Use Asset Disposal, Accumulated Amortization Right-of- Use Asset Disposal, Accumulated Amortization Right-of- Use Asset Disposal, Accumulated Amortization Non-U.S. treasury bills Non Us Treasury Bills Notes [Member] Non-US Treasury Bills notes. Litigation Case [Domain] Litigation Case [Domain] Amortization expenses related to intangible assets Intangible Asset, Finite-Lived, Amortization Expense Intangible Asset, Finite-Lived [Line Items] Intangible Asset, Finite-Lived [Line Items] Investments in privately-held companies Equity Securities, Investment Summary [Member] Intangible assets acquired during the period Intangible Asset, Finite-Lived, Acquired Other Countries Other Countries [Member] Other Countries. Periodic payment, interest Debt Instrument, Periodic Payment, Interest Non-deductible permanent difference Non-deductible permanent difference Non-deductible permanent difference Property, plant and equipment Deferred Tax Liabilities, Property, Plant and Equipment Schedule of Company's Restructuring Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Assets held for sale, current (note 3) Disposal Group, Including Discontinued Operation, Assets, Current, Total Disposal Group, Including Discontinued Operation, Assets, Current Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Acquisition of short-term investments Payments to Acquire Short-Term Investments Short Term Deferred Commission Short Term Deferred Commission Short Term Deferred Commission Subsegments [Domain] Subsegments [Domain] Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Common Stock [Roll Forward] Common Stock, Shares [Roll Forward] Common Stock, Shares [Roll Forward] Lessor, Operating Lease, Term of Contract Lessor, Operating Lease, Term of Contract Share Repurchase Program, Excise Tax Share Repurchase Program, Excise Tax Goodwill impairment loss - disc. op Goodwill impairment loss - disc. op Goodwill impairment loss - disc. op Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent Equity Investment without Readily Determinable Fair Value Equity Investment without Readily Determinable Fair Value Equity Investment without Readily Determinable Fair Value United Kingdom [Member] Income Tax Jurisdiction, Foreign [Member] Auditor Firm ID Auditor Firm ID Operating income Operating Income (Loss) Revenue, Remaining Performance Obligation, Amount Revenue, Remaining Performance Obligation, Amount Income Tax Paid, Foreign, after Refund Received Income Tax Paid, Foreign, after Refund Received Disposal Group, Including Discontinued Operation, Accrued Liabilities Disposal Group, Including Discontinued Operation, Accrued Liabilities Proceeds from Issuance of Extension Debentures and Notes (note 7) Proceeds from Issuance of Debt Debt Instrument, Convertible, Number of Equity Instruments - with decimals Debt Instrument, Convertible, Number of Equity Instruments - with decimals Debt Instrument, Convertible, Number of Equity Instruments - with decimals Other Included Other Receivables Other Included Other Receivables Other Included Other Receivables Impairment of Long-Lived Assets Held-for-use, Gross Impairment of Long-Lived Assets Held-for-use, Gross Impairment of Long-Lived Assets Held-for-use, Gross One Customer One Customer [Member] One Customer Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount Revenue Contract Balances [Abstract] Revenue Contract Balances [Abstract] Revenue Contract Balances [Abstract] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Income Tax, Examination [Table] Income Tax, Examination [Table] Equity securities Equity Securities [Member] Intellectual property disposed of by sale Intellectual property disposed of by sale Intellectual property disposed of by sale Common Stock, Shares, Issued Common Stock, Shares, Issued Beginning Balance Ending Balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Disposal Group, Including Discontinued Operation, Costs of Goods Sold Disposal Group, Including Discontinued Operation, Costs of Goods Sold Patent sale variable consideration constrained Patent sale variable consideration constrained Patent sale variable consideration constrained Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Accumulated Other Comprehensive Loss Comprehensive Income (Loss) Note [Text Block] Accounts receivable, net of allowance Increase (Decrease) in Accounts Receivable Product and Service [Domain] Product and Service [Domain] Class of Stock [Line Items] Class of Stock [Line Items] Cumulative Impact ASU 2016-01 Adoption to AOCI Cumulative Impact ASU 2016-01 Adoption to AOCI Cumulative Impact ASU 2016-01 Adoption to AOCI Restructuring Reserve, Current Restructuring Reserve, Current Deferred income tax liabilities Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Liabilities, Total [Member] Liabilities, Total [Member] Impaired Long-Lived Assets Held and Used, Asset Name [Domain] Impaired Long-Lived Assets Held and Used, Asset Name [Domain] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Lessee, Operating Lease, Liability, Payments, Due Year Three Lessee, Operating Lease, Liability, to be Paid, Year Three Termination Date Trading Arrangement Termination Date Discontinued Operations, Policy Discontinued Operations, Policy [Policy Text Block] Related Party Principal Amounts of 2020 Debenture Owned Related Party Principal Amounts of 2020 Debenture Owned Related Party Principal Amounts of 2020 Debenture Owned Net loss from discontinued operations, net of tax Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Disposal Groups, Including Discontinued Operations, Disclosure Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Statutory Canadian tax rate, Percent Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Unpaid principal balance Debt Instrument, Unpaid Principal Balance Debt Instrument, Unpaid Principal Balance Tax Year 2032 Tax Year 2032 [Member] Tax Year 2032 Accrued liabilities (note 5) Accrued liabilities total Accrued Liabilities, Current Entity Public Float Entity Public Float Fair Value as of Grant Date Award Grant Date Fair Value Aggregate Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding Income Tax Paid, Federal, before Refund Received Income Tax Paid, Federal, before Refund Received Gain on sale of property, plant and equipment, net Gain (Loss) on Disposition of Assets Gain (Loss) on Disposition of Assets Goodwill [Table] Goodwill [Table] Revenue, Remaining performance obligation time frame [Domain] Revenue, Remaining performance obligation time frame [Domain] Revenue, Remaining performance obligation time frame [Domain] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Variable incentive accrual Accrued Bonuses Arrangement Duration Trading Arrangement Duration Percentage of accounts payable denominated in foreign currencies Percentage Of Accrued Liabilities Denominated In Foreign Currencies Percentage of accrued liabilities denominated in foreign currencies. Schedule of Cash Flow Taxes, Supplemental Disclosures Schedule of Cash Flow Taxes, Supplemental Disclosures [Table Text Block] Schedule of Cash Flow Taxes, Supplemental Disclosures Facilities Reclass - Gross Margin Previously Reported Facilities Reclass - Gross Margin Previously Reported Facilities Reclass - Gross Margin Previously Reported Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Fair Value, Option, Aggregate Differences, Long-term Debt Instruments Fair Value, Option, Aggregate Differences, Long-Term Debt Instruments Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Contract with Customer, Asset, Net Contract with Customer, Asset, Net - Current and Non-Current Contract with Customer, Asset, Net - Current and Non-Current Minimum Taxes Minimum Taxes Minimum Taxes Realized losses associated with the change in fair value from credit components recorded in the consolidated statements of operations on maturity of the Prior Debentures Realized charges associated with the change in fair value from credit components recorded in the consolidated statement of operations on redemption Realized charges associated with the change in fair value from credit components recorded in the consolidated statement of operations on redemption Cost Intangible Asset, Finite-Lived, before Accumulated Amortization Revenues Total Revenue Revenues Change in consideration for business acquisition Change in consideration for business acquisition Change in consideration for business acquisition Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Finance Lease, Right-of-Use Asset, Amortization Finance Lease, Right-of-Use Asset, Amortization Option vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Goodwill [Roll Forward] Goodwill [Roll Forward] Furniture and fixtures Furniture and Fixtures [Member] Intangible Asset, Finite-Lived, Class [Domain] Intangible Asset, Finite-Lived, Class [Domain] Equity Award [Domain] Award Type [Domain] Finance Lease, Interest Expense Finance Lease, Interest Expense Tax Year 2030 Tax Year 2030 [Member] Tax Year 2030 Level 3: Level 3 Fair Value, Inputs, Level 3 [Member] US Government Agencies Debt Securities [Member] US Government Agencies Debt Securities [Member] Expected life in years Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year One Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year One Adoption 2016-1 Change in fair value of debenture from instrument-specific credit risk Adoption 2016-1 Change in fair value of debenture from instrument-specific credit risk Adoption 2016-1 Change in fair value of debenture from instrument-specific credit risk through a cumulative increase to accumulative other comprehensive income Common Stock, Shares Authorized, Unlimited [Fixed List] Common Stock, Shares Authorized, Unlimited [Fixed List] Geographical [Axis] Geographical [Axis] Accrued liabilities Increase (Decrease) in Accrued Liabilities Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent Other acquired intangibles Other Acquired Technology [Member] Other Acquired Technology [Member] Interest expense, debt Interest Expense, Debt Term Subscription Contract Duration Term Subscription Contract Duration Term Subscription Contract Duration Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Purchase of treasury stock Treasury Stock, Value, Acquired, Cost Method Payments for Restructuring Payments for Restructuring Cash, cash equivalents, restricted cash, and restricted cash equivalents, beginning of year Cash, cash equivalents, restricted cash, and restricted cash equivalents, end of year Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Total Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Intangible Asset, Finite-Lived [Table] Intangible Asset, Finite-Lived [Table] Corporate notes/bonds Corporate Bonds And Notes [Member] Corporate Bonds And Notes [Member] Ownership percentage, common shares Ownership Percentage, Common Shares Ownership Percentage, Common Shares Cumulative impact of adoption of ASU 606 Cumulative Impact ASU 606 Adoption Cumulative Impact ASU 606 Adoption Non-NEOs Non-NEOs [Member] Debt Instrument, Interest Rate Terms Debt Instrument, Interest Rate Terms Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Two Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Two Investments that are communicated to the third party for consideration of reasonableness, threshold limit for fair values Investments That Are Communicated To Third Party For Consideration Of Reasonableness Threshold Limit For Fair Value Investments That Are Communicated To Third Party For Consideration Of Reasonableness Threshold Limit For Fair Value Schedule of Debt Schedule of Debt [Table Text Block] Leases Lessee, Operating Leases [Text Block] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Revenue Contract Balances [Domain] Revenue Contract Balances [Domain] [Domain] for Revenue Contract Balances [Axis] Treasury share released for RSU settlements Stock Issued During Period Value Treasury Stock Vested Stock issued during period value treasury stock vested. Accumulated Other Comprehensive Income (Loss) [Member] Comprehensive Income [Member] Common shares repurchased Payments for Repurchase of Common Stock Facilities reclass - impact to Research and development Facilities reclass - impact to Research and development Facilities reclass - impact to Research and development Range [Axis] Statistical Measurement [Axis] Intangible Assets, Weighted average remaining useful lives [Table] Intangible Assets, Weighted average remaining useful lives [Table] Intangible Assets, Weighted average remaining useful lives [Table] Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax Term deposits, and certificates of deposits Bank Time Deposits [Member] Cost of Revenue Cost of Revenue Cost of Revenue Award Type [Axis] Award Type [Axis] Cumulative impact of adoption of ASU 2016-01 Cumulative Impact ASU 2016-01 Adoption Cumulative Impact ASU 2016-01 Adoption Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Deficit Retained Earnings (Accumulated Deficit) Facilities reclass - impact to Sales and marketing Facilities reclass - impact to Sales and marketing Facilities reclass - impact to Sales and marketing Product and Service [Axis] Product and Service [Axis] Disposal Group, Including Discontinued Operation, Acquisition of property, plant and equipment Disposal Group, Including Discontinued Operation, Acquisition of property, plant and equipment Disposal Group, Including Discontinued Operation, Acquisition of property, plant and equipment Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Total Debt Securities, Available-for-Sale Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Operating Lease, Cost Operating Lease, Cost Litigation settlement Litigation Settlement, Fee Expense Long Lived Assets Held-for-sale, Name [Domain] Long-Lived Assets Held-for-Sale, Name [Domain] Facilities reclass - impact to General and administrative Facilities reclass - impact to General and administrative Facilities reclass - impact to General and administrative Net change in deferred commission Net change in deferred commission Net change in deferred commission Research and development tax credit Research and development tax credit Research and development tax credit Intangible Asset, Finite-Lived, after Accumulated Amortization, Estimated Amortization Expense, Fiscal Year Maturity [Abstract] Intangible Asset, Finite-Lived, after Accumulated Amortization, Estimated Amortization Expense, Fiscal Year Maturity [Abstract] Senior Notes Senior Convertible Notes [Member] Senior Convertible Notes Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] CERS subsidy - % of eligible fixed property expenses CERS subsidy - % of eligible fixed property expenses CERS subsidy - % of eligible fixed property expenses Accounts receivable, net Receivable [Policy Text Block] Type of Adoption [Domain] Accounting Standards Update [Domain] Convertible Debt Convertible Debt [Table Text Block] Debt Securities, Available-for-sale, Realized Gain (Loss) Debt Securities, Available-for-Sale, Realized Gain (Loss) Due after five years Available For Sale Securities Debt Maturities After Five Years Fair Value Available for sale securities debt maturities after five years fair value. Total liabilities and shareholders' equity Liabilities and Equity Tax Year, Indefinite Tax Year, Indefinite [Member] Tax Year, Indefinite [Member] Discontinued Operations Cash flow Discontinued Operations Cash flow [Table Text Block] Discontinued Operations Cash flow Employee Stock Option [Member] Share-Based Payment Arrangement, Option [Member] Long-lived Assets and Total Assets by Geographic Areas [Table] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Intangible Assets Disclosure [Abstract] Intangible Assets Disclosure [Abstract] Intangible Assets Disclosure [Abstract] Facilities Reclass - Cybersecurity Segment GM Revised Facilities Reclass - Cybersecurity Segment GM Revised Facilities Reclass - Cybersecurity Segment GM Revised Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Asset Class [Axis] Asset Class [Axis] Restructuring Charges Restructuring Charges Tabular List, Table Tabular List [Table Text Block] Vesting [Axis] Vesting [Axis] Restricted Cash and Cash Equivalents Restricted Cash and Cash Equivalent, Noncurrent Non-cash consideration received from contracts with customers Non-cash consideration received from contracts with customers Non-cash consideration received from contracts with customers Acquisition of intangible assets Payments to Acquire Intangible Assets Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Three Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Three Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities Equity Securities, FV-NI, Unrealized Loss Equity Securities, FV-NI, Unrealized Loss Income taxes receivable Income Taxes Receivable, Current Name Awards Close in Time to MNPI Disclosures, Individual Name Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Goodwill impairment loss continuing operations Goodwill impairment loss continuing operations Goodwill impairment loss continuing operations Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax Gain on disposal of discontinued operation Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax Property, Plant and Equipment [Member] Property, Plant and Equipment [Member] Property, Plant and Equipment, Type [Domain] Long-Lived Asset, Class [Domain] Options to vest in Year 1 Options to vest in Year 1 Options to vest in Year 1 Schedule of Property, Plant and Equipment [Table] Property, Plant, and Equipment [Table] Preferred shares: authorized unlimited number of non-voting, cumulative, redeemable and retractable Preferred Stock, Value, Issued Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount Adjustment to Compensation: Adjustment to Compensation [Axis] Restructuring Cost and Reserve Restructuring Cost and Reserve [Line Items] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Interest paid during the year Interest Paid, Excluding Capitalized Interest, Operating Activity Gain on sale of investments, equity investments without readily determinable fair value Gain on Sale of Investments Restructuring and Integration Restructuring and Related Activities Disclosure [Text Block] Debt Instrument, Frequency of Periodic Payment Debt Instrument, Frequency of Periodic Payment Non-U.S. government sponsored enterprise notes Non Us Government Sponsored Enterprise Notes [Member] Non-US Government Sponsored Enterprise Notes. Finance Lease, Liability, Payments, Due Year Five Finance Lease, Liability, to be Paid, Year Five Common share consideration from sale of disc. op Common share consideration from sale of disc. op Common share consideration from sale of disc. op Name Measure Name Acquisition of restricted short-term investments Payments to Acquire Restricted Investments Pay vs Performance Disclosure [Line Items] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Canadian Income (Loss) from Continuing Operations before Income Taxes, Domestic PBRSU Share Limit PBRSU Share Limit PBRSU Share Limit Acquired technology Acquired technology Acquired Technology [Member] Acquired Technology. Impairment of goodwill Goodwill, Impairment Loss Name Trading Arrangement, Individual Name Cash and cash equivalents (note 4) Cash and Cash Equivalent Company Selected Measure Amount Company Selected Measure Amount Tax Period [Domain] Tax Period [Domain] Segment Reporting, Reconciliation of Profit (Loss) by Segment to Consolidated Segment Reporting, Reconciliation of Profit (Loss) by Segment to Consolidated [Table Text Block] Amortization Depreciation, Depletion and Amortization Capital Loss Carryforward Capital Loss Carryforward Capital Loss Carryforward Schedule of Basic and Diluted Earnings Per Share Schedule of Basic and Diluted Earnings Per Share [Table Text Block] [Table Text Block] for Schedule of Basic and Diluted Earnings Per Share [Table] Operating Lease, Weighted Average Remaining Lease Term Operating Lease, Weighted Average Remaining Lease Term Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, after Tax Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, after Tax Non-PEO NEO Non-PEO NEO [Member] TBRSU Share Limit TBRSU Share Limit TBRSU Share Limit Customer Concentration Risk [Member] Customer Concentration Risk [Member] Award Timing Method Award Timing Method [Text Block] Segment gross margin Segment gross margin Segment gross margin Net increase (decrease) in cash, cash equivalents, restricted cash, and restricted cash equivalents during the year Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Deferred income tax assets Deferred Tax Assets, Net of Valuation Allowance Deferred Tax Assets, Gross Deferred Tax Assets, Gross Facilities Reclass - IoT Segment GM Previously Reported Facilities Reclass - IoT Segment GM Previously Reported Facilities Reclass - IoT Segment GM Previously Reported Share-based Payment Arrangement, Tranche Three [Member] Share-Based Payment Arrangement, Tranche Three [Member] Net income (loss) Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Location, Statement of Financial Position, Balance [Axis] Location, Statement of Financial Position, Balance [Axis] Proceeds on sale of property, plant and equipment Proceeds from Sale of Property, Plant, and Equipment Restatement Determination Date: Restatement Determination Date [Axis] Components of Accumulated Other Comprehensive Loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Licensing Licensing [Member] Licensing Litigation Settlement, Amount Awarded to Other Party Litigation Settlement, Amount Awarded to Other Party Leases Lessee, Leases [Policy Text Block] Replacement award [Member] Replacement award [Member] Replacement award [Member] Accounts Receivable, Allowance for Credit Loss, Relating to CECL Estimated Based on Days Past Due and Region Accounts Receivable, Allowance for Credit Loss, Relating to CECL Estimated Based on Days Past Due and Region Accounts Receivable, Allowance for Credit Loss, Relating to CECL Estimated Based on Days Past Due and Region Consolidated income from continuing operations before income taxes Net income (loss) for basic and diluted earnings (loss) per share available to common shareholders from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Condensed Balance Sheet Statements, Captions [Line Items] Condensed Balance Sheet Statements, Captions [Line Items] Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Amount Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Amount Revenue Revenues [Abstract] Long lived asset impairment loss continuing operations Long lived asset impairment from continuing operations Long lived asset impairment from continuing operations Reducing balance method depreciation percentage Property Plant And Equipment Reducing Balance Method Depreciation Percentage Property plant and equipment reducing balance method depreciation percentage. Prior Debentures fair value adjustment Income associated with the change in fair value from non-credit components recorded in the consolidated statements of operations of the Prior Debentures Fair Value, Option, Changes in Fair Value, Gain (Loss) Panasonic Corporation [Member] Panasonic Corporation [Member] Panasonic Corporation [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Date of first interest payment Date of first interest payment Date of first interest payment Intangible assets, remaining useful life Intangible Asset, Finite-Lived, Remaining Amortization Period Average Remaining Contractual Life in Years Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted-Average Remaining Contractual Term Range [Domain] Statistical Measurement [Domain] Impaired Long-Lived Assets Held and Used by Type [Axis] Impaired Long-Lived Assets Held and Used by Type [Axis] Document Fiscal Year Focus Document Fiscal Year Focus BlackBerry-Cylance Plan - Authorized Number of shares BlackBerry-Cylance Plan - Authorized Number of shares BlackBerry-Cylance Plan - Authorized Number of shares Number (000’s) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Royalties Royalty Fees Liability [Policy Text Block] Royalty Fees Liability [Policy Text Block] Facility Costs Facilities reclass - impact to cost of sales Facilities reclass - impact to cost of sales Tax Year 2036 Tax Year 2036 [Member] Tax Year 2036 Common shares: authorized unlimited number of non-voting, redeemable, retractable Class A common shares and unlimited number of voting common shares Issued - 587,431,120 voting common shares (February 28, 2025 - 590,230,655) Common Stock, Value, Issued Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months Lessee, Operating Lease, Liability, to be Paid, Year One Investments in privately-held companies Auction Rate Securities [Member] Schedule of Debentures Schedule of Long-Term Debt Instruments [Table Text Block] Intangible Assets, Weighted average remaining useful lives [Line Items] Intangible Assets, Weighted average remaining useful lives [Line Items] [Line Items] for Intangible Assets, Weighted average remaining useful lives [Table] Fair Value Measurements, Cash, Cash Equivalents and Investments Cash, Cash Equivalent, and Short-Term Investment [Text Block] Transferred over Time [Member] Transferred over Time [Member] Restatement Determination Date Restatement Determination Date Valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Date the Company can not redeem prior to, except for certain tax law changes Date the Company can not redeem prior to, except for certain tax law changes Date the Company can not redeem prior to, except for certain tax law changes Bank Balances and Other Investments [Domain] Bank Balances and Other Investments [Domain] Bank Balances and Other Investments [Domain] Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Debentures fair value impact on Diluted EPS from net income (loss) Debentures fair value impact on Diluted EPS from net income (loss) Debentures fair value impact on Diluted EPS from net income (loss) U.S. federal statutory income tax rate U.S. federal statutory income tax rate U.S. federal statutory income tax rate Accounts Receivable, Allowance for Credit Loss Accounts Receivable, Allowance for Credit Loss, Beginning Balance Accounts Receivable, Allowance for Credit Loss, Ending Balance Accounts Receivable, Allowance for Credit Loss Accrued interest Unrecognized Tax Benefits, Interest on Income Taxes Accrued Amendment Flag Amendment Flag Goodwill [Line Items] Goodwill [Line Items] Current Liabilities, Current [Abstract] Conversion of stock (in shares) Conversion of Stock, Shares Converted Finance Lease, Principal Payments Finance Lease, Principal Payments Finance Lease, Principal Payments Net investment income Net Investment Income Common shares issued on the redemption of deferred share units Stock Issued During Period, Shares, Other Facilities Reclass - Sales and Marketing Previously Reported Facilities Reclass - Sales and Marketing Previously Reported Facilities Reclass - Sales and Marketing Previously Reported Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining performance obligation time frame [Axis] Revenue, Remaining performance obligation time frame [Axis] Finance Lease, Right-of-Use Asset, before Accumulated Amortization Finance Lease, Right-of-Use Asset, before Accumulated Amortization Non-deductible permanent difference, percent Non-deductible permanent difference, percent Non-deductible permanent difference, percent Tax Year 2044 Tax Year 2044 [Member] Tax Year 2044 Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] Income Tax Paid, by Individual Jurisdiction [Line Items] Income Tax Paid, by Individual Jurisdiction [Line Items] Facilities Reclass - Cybersecurity Segment COS Revised Facilities Reclass - Cybersecurity Segment COS Revised Facilities Reclass - Cybersecurity Segment COS Revised Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Entity Address, State or Province Entity Address, State or Province PEO Total Compensation Amount PEO Total Compensation Amount Initial increase to the interest rate of senior note due to default Initial increase to the interest rate of senior note due to default Initial increase to the interest rate of senior note due to default Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Tax Year 2028 [Member] Tax Year 2028 [Member] Tax Year 2028 [Member] Lease term Letters of Credit, Lease Term Letters of Credit, Lease Term Share-based Compensation [Abstract] Share-Based Payment Arrangement, Noncash Expense [Abstract] Weighted-average number of shares outstanding (000's) - basic and diluted Weighted Average Number of Shares Outstanding, Basic Share Repurchase Program [Domain] Share Repurchase Program [Domain] Increase for income tax positions of prior years Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Operating lease liabilities, current (included in accruals) Operating lease liabilities, current (included in accruals) Operating lease liabilities, current (included in accruals) Reclassification out of Accumulated Other Comprehensive Inc. [Domain] Reclassification out of Accumulated Other Comprehensive Inc. [Domain] [Domain] for Reclassification out of Accumulated Other Comprehensive Income Fair Value Cash, Cash Equivalents And Investments Cash Cash Equivalents And Investments At Fair Value Cash, cash equivalents and investments at fair value. BlackBerry operations and other information technology Technology Equipment [Member] Contract with Customer, Performance Obligation Satisfied in Previous Period Contract with Customer, Performance Obligation Satisfied in Previous Period Lessee, Operating Lease, Liability, Payments, Due Year Four Lessee, Operating Lease, Liability, to be Paid, Year Four Voting Common Stock [Member] Voting Common Stock [Member] Voting Common Stock [Member] Debenture - impact of changes in fair value Debenture - impact of changes in fair value [Table Text Block] Debenture - impact of changes in fair value Deferred revenue Increase (Decrease) in Deferred Revenue Supplemental Cash Flow Information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Cost Basis Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract] Earnings Per Share [Line Items] Earnings Per Share [Line Items] Earnings Per Share [Line Items] ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Document Information [Line Items] Document Information [Line Items] Assets held for sale, non-current (note 3) Disposal Group, Including Discontinued Operation, Assets, Total Disposal Group, Including Discontinued Operation, Assets Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Vested during the period, Number Number of options settled upon vesting by the issuance of new common shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Class of Stock [Axis] Class of Stock [Axis] Other-than- temporary Impairment Other than Temporary Impairment Losses, Investments Basis of presentation and preparation Basis of Accounting, Policy [Policy Text Block] Decrease in valuation allowance from U.S tax reform Decrease in valuation allowance from U.S tax reform Decrease in valuation allowance from U.S tax reform Common shares issued on the redemption of deferred share units Common shares issued on the redemption of deferred share units Common shares issued on the redemption of deferred share units Sublease Income Sublease Income Accumulated Amortization Intangible Asset, Finite-Lived, Accumulated Amortization Revenue Contract Balances [Table] Revenue Contract Balances [Table] Revenue Contract Balances [Table] Maximum ownership allowed after converting 1.75% Debenture Maximum ownership allowed after converting 1.75% Debenture Maximum ownership allowed after converting 1.75% Debenture Lessee, Remaining Lease Term Lessee, Remaining Lease Term Lessee, Remaining Lease Term Debenture implied discount Debenture implied discount Debenture implied discount Realized gains (losses) on non-marketable equity investments without readily determinable fair value sold during the period Realized gains (losses) on non-marketable equity investments without readily determinable fair value sold during the period Realized gains (losses) on non-marketable equity investments without readily determinable fair value sold during the period Unrecognized income tax benefit will decrease in the next twelve months Increase in Unrecognized Tax Benefits is Reasonably Possible New Accounting Pronouncements, Policy New Accounting Pronouncements, Policy [Policy Text Block] Earnings (loss) per share Earnings Per Share, Policy [Policy Text Block] Litigation Case [Axis] Litigation Case [Axis] Deferred share units redeemed Deferred share units redeemed Deferred share units redeemed Gain on sale of property, plant and equipment, net Gain (Loss) on Disposition of Property Plant Equipment Payments of Debt Issuance Costs Amortization of Debt Issuance Costs Facilities reclass - impact to IoT Segment gross margin Facilities reclass - impact to IoT Segment gross margin Facilities reclass - impact to IoT Segment gross margin Accrued Liabilities Schedule of Accrued Liabilities [Table Text Block] Long-term notes (note 7) Long-Term Debt Income taxes payable Increase (Decrease) in Income Taxes Payable Proceeds on sale, maturity or distribution from long-term investments Proceeds From Sale And Maturity Of Long Term Marketable Securities And Other Investments The cash inflow associated with the aggregate amount received by the entity through sale or maturity of long-term marketable securities (trading, held-to-maturity, or available-for-sale) and other investments during the period. Number of exchanges shares remaining to be issued Number of exchanges shares remaining to be issued Number of exchanges shares remaining to be issued Net changes in working capital items Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Net cash provided by investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Unrecognized income tax benefits, Beginning balance Unrecognized income tax benefits, Ending balance Unrecognized Tax Benefits Security Exchange Name Security Exchange Name Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments other than Options, Weighted Average Grant Date Fair Value [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments other than Options, Weighted Average Grant Date Fair Value [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments other than Options, Weighted Average Grant Date Fair Value [Roll Forward] Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Less than 12 months Less than 12 months [Member] Less than 12 months [Domain] United Kingdom Foreign Tax Jurisdiction - UK [Member] Foreign Tax Jurisdiction - UK Realized losses associated with the change in fair value from credit components released from AOCL on maturity of the Prior Debentures Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Reclassification Adjustment from AOCI for Derecognition, before Tax Vested and Expected to Vest, Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Intrinsic Value Number of common shares authorized under the Equity Plan (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Employee Termination Benefits One-time Termination Benefits [Member] Finance Lease, Right-of-Use Asset Finance Lease, Right-of-Use Asset, after Accumulated Amortization Property, Plant, and Equipment Property, Plant, and Equipment [Table Text Block] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Federal tax rate after federal tax abatement Federal tax rate after federal tax abatement Federal tax rate after federal tax abatement Ownership percentage by arms length party, common shares Ownership Percentage by Arms Length Party, Common Shares Ownership Percentage by Arms Length Party, Common Shares Proceeds on sale or maturity of restricted short-term investments Proceeds from Sale of Restricted Investments Name Outstanding Recovery, Individual Name Disposal Group, Including Discontinued Operation, Impairment of long-lived assets Disposal Group, Including Discontinued Operation, Impairment of long-lived assets Disposal Group, Including Discontinued Operation, Impairment of long-lived assets Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Tax Year 2031 Tax Year 2031 [Member] Tax Year 2031 Impairment on non-marketable equity investments without readily determinable fair value Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount Geographical [Domain] Geographical [Domain] Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Gain (Loss) from Litigation Settlement Gain (Loss) from Litigation Settlement Components of Cash, Cash Equivalents and Investments Schedule Of Cash Cash Equivalents And Investments By Major Components Table [Text Block] Components of cash, cash equivalents and investments. Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Other tax carryforwards Deferred Tax Assets, Other Tax Carryforwards Award Date [Axis] Award Date [Axis] Increase in deferred commission Increase in deferred commission Increase in deferred commission Net change in unrealized losses on available-for-sale investments (note 10) OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax Basic loss per share from discontinued operations Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Per Basic Share Transaction price allocated to the remaining performance obligations [Table] Transaction price allocated to the remaining performance obligations [Table] Transaction price allocated to the remaining performance obligations [Table] Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent Property, plant, equipment and intangibles assets Deferred Tax Assets, Property, Plant and Equipment Expected to Vest, Outstanding Number Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Outstanding Number Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Outstanding Number Asset Class [Domain] Asset Class [Domain] Convertible debentures Debt, Policy [Policy Text Block] Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Weighted Average Number of Shares Outstanding, Diluted Weighted Average Number of Shares Outstanding, Diluted Impairment Of Right of Use Asset and related Property, Plant and Equipment Impairment Of Right of Use Asset and related Property, Plant and Equipment Impairment Of Right of Use Asset and related Property, Plant and Equipment Entity Emerging Growth Company Entity Emerging Growth Company Derivative financial instruments Derivatives, Policy [Policy Text Block] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Debentures (note 7) Deferred Tax Assets, Convertible Debentures Deferred Tax Assets, Convertible Debentures Commercial paper Commercial Paper [Member] Germany Foreign Tax Jurisdiction - Germany [Member] Foreign Tax Jurisdiction - Germany Lessee, Operating Lease, Liability, Undiscounted Excess Amount Lessee, Operating Lease, Liability, Undiscounted Excess Amount Award Date [Domain] Award Date [Domain] Facilities Reclass - Research and Development Revised Facilities Reclass - Research and Development Revised Facilities Reclass - Research and Development Revised Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Percent Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Percent Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statement [Table] Impairment Of Right of Use Assets Impairment Of Right of Use Assets Impairment Of Right of Use Assets Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Other receivables (note 5) Other Receivables Impairment of long-lived assets (note 4) Long-Lived Asset, Held and Used, Impairment Loss Cost of sales Cost of Revenue [Abstract] Canadian Deferred Federal Income Tax Expense (Benefit) Collateral of outstanding letters of credit Letters of Credit Outstanding, Amount Number of trading days Number Of Trading Days Number of trading days preceding the redemption date of DSUs in order to arrive at the weighted average trading price of the Company's shares. Unrecognized tax benefits included within taxes payable Unrecognized tax benefits included within taxes payable Unrecognized tax benefits included within taxes payable Revenue by Product and Service Type Revenue by Type [Table Text Block] Revenue by Type [Table Text Block] Other Unrecognized Tax Benefits Other Unrecognized tax benefits other. Total transaction price for patent sale agreement Total transaction price for patent sale agreement Total transaction price for patent sale agreement Facilities Reclass - IoT Segment COS Previously Reported Facilities Reclass - IoT Segment COS Previously Reported Facilities Reclass - IoT Segment COS Previously Reported Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Lessee, Operating Lease, Liability, Payments, Due, Total Lessee, Operating Lease, Liability, to be Paid Disposal Group, Including Discontinued Operation, Gross Profit (Loss) Disposal Group, Including Discontinued Operation, Gross Profit (Loss) Tax Year 2040 Tax Year 2040 [Member] Tax Year 2040 [Member] Beginning balance, Weighted-Average Grant Date Fair Value Ending balance, Weighted-Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Present Value of Delayed Cash Payment from Cylance Sale Present Value of Delayed Cash Payment from Cylance Sale Present Value of Delayed Cash Payment from Cylance Sale All Executive Categories All Executive Categories [Member] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Restricted Short-term Investments Restricted Investments Accumulated Amortization of property, plant and equipment, net sold Accumulated Amortization of property, plant and equipment, net sold Accumulated Amortization of property, plant and equipment, net sold Research and development Deferred Tax Assets, Research and Development Deferred Tax Assets, Research and Development Liability for uncertain income tax positions, percentage minimum Liability For Uncertain Tax Positions Percentage Minimum Liability for uncertain tax positions percentage minimum. Percentage of Entity Public Float as of May 5, 2025 Percentage of Entity Public Float as of May 5, 2025 Percentage of Entity Public Float as of May 5, 2025 Disposal Group, Including Discontinued Operation, Intangible Assets Disposal Group, Including Discontinued Operation, Intangible Assets Sales and marketing Selling and Marketing Expense Principal repayments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Income taxes receivable Increase (Decrease) in Income Taxes Receivable Change in Fair Value From Instrument-Specific Credit Risk On Debentures Accumulated Gain (Loss), Financial Liability, Fair Value Option, Attributable to Parent [Member] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Gains (losses) on Cash Flow Hedges Gains and Losses on Cash Flow Hedges Gains and Losses on Cash Flow Hedges Revenue and Segment Disclosures Segment Reporting [Text Block] Minimum Minimum [Member] Unrecognized tax benefits netted against deferred income taxes Unrecognized tax benefits netted against deferred income taxes Unrecognized tax benefits netted against deferred income taxes Related Party Principal Amounts of Extension Debenture Owned Related Party Principal Amounts of Extension Debenture Owned Related Party Principal Amounts of Extension Debenture Owned Auditor Name Auditor Name Intangible Asset Useful Lives Intangible Asset Useful Lives [Table Text Block] Intangible Asset Useful Lives Liabilities Liabilities [Abstract] Effect of foreign exchange gain (loss) on cash, cash equivalents, restricted cash, and restricted cash equivalents Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Reclassification out of Accumulated Other Comprehensive Inc. [Axis] Reclassification out of Accumulated Other Comprehensive Inc. [Axis] Reclassification out of Accumulated Other Comprehensive Income Location, Statement of Income, Balance [Axis] Location, Statement of Income, Balance [Axis] Basic earnings (loss) per share from continuing operations Income (Loss) from Continuing Operations, Per Basic Share Diluted earnings (loss) per share from continuing operations Income (Loss) from Continuing Operations, Per Diluted Share Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Employee Service Share Based Compensation Tax Deficiencies Realized From Exercise Of Stock Options Employee Service Share Based Compensation Tax Deficiencies Realized From Exercise Of Stock Options Employee service share based compensation tax deficiencies realized from exercise of stock options. Facilities Reclass - Sales and Marketing Revised Facilities Reclass - Sales and Marketing Revised Facilities Reclass - Sales and Marketing Revised Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Axis] Increase in contract receivable Increase in contract asset Increase in contract asset Debt Instrument, Maturity Date Range, End Debt Instrument, Maturity Date Range, End Disposal Group, Including Discontinued Operation, Operating Expense Disposal Group, Including Discontinued Operation, Operating Expense Effect of foreign exchange on non-U.S. dollar denominated goodwill Goodwill, Foreign Currency Translation and Measurement Period Adjustments Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net Disposal Group, Including Discontinued Operation, Other Assets, Current Tax Year 2045 Tax Year 2045 [Member] Tax Year 2045 Useful life of finite-lived intangible assets Intangible Asset, Finite-Lived, Useful Life Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] CEWS received after this date are subject to repayment if certain conditions are not met CEWS received after this date are subject to repayment if certain conditions are not met CEWS received after this date are subject to repayment if certain conditions are not met Income (loss) before income taxes: Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest [Abstract] Patent Abandonment classified as impairment of LLA, Net Book Value Patent Abandonment classified as impairment of LLA, Net Book Value Patent Abandonment classified as impairment of LLA, Net Book Value Exercise Price Award Exercise Price Restructuring Cost [Table] Restructuring Cost [Table] Facilities and Other Charges Facility Closing [Member] Debt Securities, Available-for-sale, Unrealized Loss Debt Securities, Available-for-Sale, Unrealized Loss Segment Reporting [Line Items] Segment Reporting [Line Items] Consolidated Balance Sheet [Abstract] Consolidated Balance Sheet [Abstract] Consolidated Balance Sheet [Abstract] Number of customers that comprised more than 10% of total revenue Segment Reporting, Customer, Extent of Reliance, Description Additional Information [Line Items] Additional Information [Line Items] Additional Information [Line Items] Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Other Post-Employment Benefit Obligations Other Post-Employment Benefit Obligations [Member] Other Post-Employment Benefit Obligations Redemption period, end date Debt Instrument, Redemption Period, End Date Capital Stock and Additional Paid-In Capital [Member] Common Stock Including Additional Paid in Capital [Member] Long-lived Assets and Total Assets by Geographic Areas Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Long-Lived Asset [Table Text Block] Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Performance Adjustment In Period Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Performance Adjustment In Period Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Performance Adjustment In Period Exchange shares related to Cylance acquisition Exchange shares related to business combination Exchange shares related to business combination Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Other receivables Increase (Decrease) in Other Receivables Restructuring reserve Restructuring Reserve Equity Component [Domain] Equity Component [Domain] Basic Part I federal tax rate Basic Part I federal tax rate Basic Part I federal tax rate Stock repurchased, amount charged against retained earnings Stock repurchased, amount charged against retained earnings Stock repurchased, amount charged against retained earnings Other accrued liabilities greater than five percent of current liabilities Other Accrued Liabilities Greater than Five Percent of Current Liabilities Other Accrued Liabilities Greater than Five Percent of Current Liabilities Disposal Group, Including Discontinued Operation, Deferred Revenue, Noncurrent Disposal Group, Including Discontinued Operation, Deferred Revenue, Noncurrent Adoption Date Trading Arrangement Adoption Date Selling, marketing and administration [Member] Selling, marketing and administration [Member] Selling, marketing and administration [Member] Current assets Current assets [Member] Current assets Deferred income tax expense from U.S. tax reform Deferred income tax expense from U.S. tax reform Deferred income tax expense from U.S. tax reform Percent of debt holders (not less than) Debt Instrument, Debt Default, Percent Of Debt Holders Debt Instrument, Debt Default, Percent Of Debt Holders Restructuring Type [Axis] Restructuring Type [Axis] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Disposal Group, Including Discontinued Operation, Depreciation and Amortization Disposal Group, Including Discontinued Operation, Depreciation and Amortization Accounting Policies [Abstract] Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Risk-free interest rates Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Operating Lease, Liability, Total Operating Lease, Liability Operating Lease, Liability Operating Lease, Liability Finance Lease, Liability, Total Finance Lease, Liability, Total Finance Lease, Liability Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Tax Year 2035 Tax Year 2035 [Member] Tax Year 2035 Share Repurchase Program, Authorized, Number of Shares Share Repurchase Program, Authorized, Number of Shares Long-Term Debt, Contingent Payment of Principal or Interest Long-Term Debt, Contingent Payment of Principal or Interest Repayments of Debt Repayments of Debt Repayments of Debt Type of Restructuring [Domain] Type of Restructuring [Domain] Research and development Research, Development, and Computer Software, Policy [Policy Text Block] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Patent sale cash consideration on closing Patent sale cash consideration on closing Patent sale cash consideration on closing Restricted Share Units (RSUs) Restricted Stock Units (RSUs) [Member] Deferred Revenue, Additions Deferred Revenue, Additions Capital stock outstanding, Value, Beginning Balance Capital stock outstanding, Value, Ending Balance Common Stock, Value, Outstanding All Adjustments to Compensation All Adjustments to Compensation [Member] Facilities reclass - impact to Gross Margin Facilities reclass - impact to Gross Margin Facilities reclass - impact to Gross Margin Subsequent increase to the interest rate of senior note due to default Subsequent increase to the interest rate of senior note due to default Subsequent increase to the interest rate of senior note due to default Income taxes Income Tax, Policy [Policy Text Block] Net cash provided by (used in) operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Accounts Receivable [Member] Accounts Receivable [Member] Income Statement [Abstract] Income Statement [Abstract] Shareholders' Equity Equity, Attributable to Parent [Abstract] Common shares issued for employee share purchase plan Stock Issued During Period, Shares, Employee Stock Purchase Plans Document Transition Report Document Transition Report Assets Deferred Tax Assets, Net [Abstract] Deferred income tax assets Deferred Income Tax Assets, Net Operating expenses Operating Expenses [Abstract] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Intangible Assets Intangible Asset, Finite-Lived [Table Text Block] Deferred revenue, current (note 13) Deferred Revenue, Current Maturity period of cash equivalents Maturity period of cash equivalents Maturity period of cash equivalents Treasury shares released for RSU settlements Stock Issued During Period Shares Treasury Stock Vested Stock issued during period shares treasury stock vested. City Area Code City Area Code RSUs vesting period Share Based Compensation Arrangement By Share Based Payment Award Other Than Stock Options Award Vesting Period Description of the period of time over which an employee's right to exercise an RSU award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, and is expressed in years. RSUs eligible to vest RSUs eligible to vest RSUs eligible to vest Document Information [Table] Document Information [Table] Related Party Principal Amounts of 1.75% Debenture Owned Related Party Principal Amounts of 1.75% Debenture Owned Related Party Principal Amounts of 1.75% Debenture Owned Name Forgone Recovery, Individual Name Expected to Vest, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Weighted Average Grant Date Fair Value Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Decrease in contract asset Decrease in contract asset Decrease in contract asset Patent Abandonment, Accumulated Amortization Patent Abandonment, Accumulated Amortization Patent Abandonment, Accumulated Amortization Other Long-Term Assets Greater than Five Percent of Total Assets Other Long-Term Assets Greater than Five Percent of Total Assets Other Long-Term Assets Greater than Five Percent of Total Assets Effective Income Tax Rate Reconciliation [Line Items] Effective Income Tax Rate Reconciliation [Line Items] Facilities Reclass - General and administrative Previously Reported Facilities Reclass - General and administrative Previously Reported Facilities Reclass - General and administrative Previously Reported Major customer axis [Axis] Major customer axis [Axis] Major customer axis Canadian tax rate differences Impact Of Canadian Us Dollar Functional Currency Election Impact of Canadian US Dollar Functional Currency Election. Finance Lease, Right-Of-Use Asset (Accumulated Amortization) Finance Lease, Right-of-Use Asset, Accumulated Amortization Restricted Share Unit Activity Share-Based Payment Arrangement, Outstanding Award, Activity, Excluding Option [Table Text Block] Tax Year 2037 Tax Year 2037 [Member] Tax Year 2037 Actuarial gains associated with other post-employment benefit obligations Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent Number of customers with a balance greater than 10% of total accounts receivable Number of Customers With a Balance Greater than 10% of Total Accounts Receivable Number of Customers With a Balance Greater than 10% of Total Accounts Receivable Employee share purchase plan Stock Issued During Period, Value, Employee Stock Purchase Plan Other assets Increase (Decrease) in Other Operating Assets Tax Year 2029 Tax Year 2029 [Member] Tax Year 2029 Net deferred income tax asset (liability) Deferred Tax Liabilities, Net Disposal Group, Including Discontinued Operation, Other long-term assets Disposal Group, Including Discontinued Operation, Operating lease right-of-use assets, net Disposal Group, Including Discontinued Operation, Operating lease right-of-use assets, net Current Current Income Tax Expense (Benefit), Continuing Operations [Abstract] NEW YORK STOCK EXCHANGE, INC. [Member] NEW YORK STOCK EXCHANGE, INC. [Member] Liability related to deferred share unit plan Deferred Compensation Arrangement with Individual, Recorded Liability Allocated Share-based Compensation Expense Share-Based Payment Arrangement, Expense Stock Repurchased and Retired During Period, Shares Stock Repurchased and Retired During Period, Shares Exercised during the year, Number Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Cash and cash equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Income Tax Jurisdiction, Foreign, Other Income Tax Jurisdiction, Foreign, Other [Member] Granted during the period, Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Due in one year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Subsequent Event Type [Domain] Subsequent Event Type [Domain] Income taxes payable (note 6) Taxes Payable, Current Schedule of Cash Flow Lease, Supplemental Disclosures Schedule of Cash Flow Lease, Supplemental Disclosures [Table Text Block] Schedule of Cash Flow Lease, Supplemental Disclosures Accounting Standards Update 2016-13 [Member] Accounting Standards Update 2016-13 [Member] Cancelled during the period, Weighted-Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Available-for-Sale Debt Securities AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Payments of Debt Issuance Costs Payments of Debt Issuance Costs Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Entity Current Reporting Status Entity Current Reporting Status Net cash provided by (used in) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Diluted loss per share from discontinued operations Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Cost Basis Cash Cash Equivalents And Investments At Cost Cash, cash equivalents and investments at cost. Disposal Group, Including Discontinued Operation, Sales and marketing Disposal Group, Including Discontinued Operation, Sales and marketing Disposal Group, Including Discontinued Operation, Sales and marketing Facilities Reclass - Cybersecurity Segment GM Previously Reported Facilities Reclass - Cybersecurity Segment GM Previously Reported Facilities Reclass - Cybersecurity Segment GM Previously Reported ASU 2016-1 Adoption - change in fair value equity securities to investment income ASU 2016-1 Adoption - change in fair value equity securities to investment income ASU 2016-1 Adoption - change in fair value equity securities to investment income Research and development Research and Development Expense Adjustments to reconcile net income (loss) to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Accounts Receivable, Allowance for Credit Loss, Writeoff Accounts Receivable, Allowance for Credit Loss, Writeoff Provincial tax rate Provincial tax rate Provincial tax rate Reconciliation of Beginning and Ending Amount of Unrecognized Income Tax Benefits Schedule Of Reconciliation Of Unrecognized Tax Benefits Table [Text Block] Schedule of reconciliation of unrecognized tax benefits. Cash flows from financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Property, plant and equipment, net (note 5) Net book value Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Income Tax Paid, State and Local, after Refund Received Income Tax Paid, State and Local, after Refund Received Financial Instruments [Domain] Financial Instruments [Domain] Intangible Asset, Finite-Lived, Class [Axis] Intangible Asset, Finite-Lived, Class [Axis] Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) Underlying Securities Award Underlying Securities Amount Changes in Issued and Outstanding Common Shares Changes In Issued And Outstanding Common Shares Table [Text Block] Changes in issued and outstanding common shares. Income (Loss) from Continuing Operations Before Income Taxes Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Long-lived Assets and Total Assets by Geographic Areas [Line Items] Long-lived Assets and Total Assets by Geographic Areas [Line Items] [Line Items] for Long-lived Assets and Total Assets by Geographic Areas [Table] Canada [Member] Income Tax Jurisdiction, Domestic State and Local [Member] Subsegments [Axis] Subsegments [Axis] Tax Credit Carryforward [Line Items] Tax Credit Carryforward [Line Items] Revenue Classified by Timing of Recognition Revenue classified by timing of recognition [Table Text Block] [Table Text Block] for Revenue classified by timing of recognition [Table] Operating Lease, Weighted Average Discount Rate, Percent Operating Lease, Weighted Average Discount Rate, Percent Segment Reporting [Table] Segment Reporting [Table] Shares in the equity pool available for future grants Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Government Assistance, Asset, Statement of Financial Position [Extensible Enumeration] Government Assistance, Asset, Statement of Financial Position [Extensible Enumeration] Components of Lease Expense Lease, Cost [Table Text Block] Other current assets (note 5) Other Assets, Current Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Income tax expense, net Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax Revenue Contract Balances Revenue Contract Balances [Table Text Block] [Table Text Block] for Revenue Contract Balances [Table] Current Fiscal Year End Date Current Fiscal Year End Date Percentage of accounts receivable denominated in foreign currencies Percentage Of Accounts Receivable Denominated In Foreign Currencies Percentage of accounts receivable denominated in foreign currencies. Percentage change of control Par Value Repurchase, Percentage, Change of Control Par Value Repurchase, Percentage, Change of Control New Accounting Pronouncement, Early Adoption [Line Items] New Accounting Pronouncement, Early Adoption [Line Items] (Deprecated 2021) Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Inducement Awards [Member] Inducement Awards [Member] Inducement Awards Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Long-Lived Asset, Excluding Financial Instrument, Customer Relationship, Mortgage Servicing Right, Deferred Policy Acquisition Cost, and Deferred Tax Asset, Amount Long-Lived Asset, Excluding Financial Instrument, Customer Relationship, Mortgage Servicing Right, Deferred Policy Acquisition Cost, and Deferred Tax Asset, Amount Cumulative Effect, Period of Adoption [Domain] Cumulative Effect, Period of Adoption [Domain] Stock Repurchased During Period, Shares Stock Repurchased During Period, Shares Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Entity File Number Entity File Number Segment Reporting, Reconciling Item, Stock Compensation Segment Reporting, Reconciling Item, Stock Compensation Segment Reporting, Reconciling Item, Stock Compensation Summary of Option Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Facilities Reclass - Research and Development Previously Reported Facilities Reclass - Research and Development Previously Reported Facilities Reclass - Research and Development Previously Reported Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Measure: Measure [Axis] Equity Securities, FV-NI, Unrealized Gain Equity Securities, FV-NI, Unrealized Gain Assets held for sale, non-current (note 3) Asset, Held-for-Sale, Not Part of Disposal Group Long Lived Assets Held-for-sale by Asset Type [Axis] Long-Lived Asset, Held-for-Sale, Type [Axis] Percentage of cash and cash equivalents denominated in foreign currencies Percentage Of Cash And Cash Equivalents Denominated In Foreign Currencies Percentage of cash and cash equivalents denominated in foreign currencies. Equity Components [Axis] Equity Components [Axis] Debt Instrument, Repurchase Amount Debt Instrument, Repurchase Amount Disposal Group, Including Discontinued Operation, General and administrative Disposal Group, Including Discontinued Operation, General and administrative Disposal Group, Including Discontinued Operation, General and administrative Capitalized Contract Cost, Net Capitalized Contract Cost, Net Income taxes paid during the year Income Tax Paid, after Refund Received Cumulative Effect, Period of Adoption [Axis] Cumulative Effect, Period of Adoption [Axis] Valuation allowance Deferred Tax Assets, Valuation Allowance Litigation Settlement Interest Litigation Settlement Interest Entity Interactive Data Current Entity Interactive Data Current Finance Lease, Liability, Current Finance Lease, Liability, Current Deferred Shared Unit Stock Issued During Period, Value, Deferred Shared Unit Stock Issued During Period, Value, Deferred Shared Unit Derivative asset, fair value of collateral Derivative Asset, Fair Value of Collateral Due in one to five years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Fair Value Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] Entity Small Business Entity Small Business Open Tax Year by Major Tax Jurisdictions Open Tax Year Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Title of 12(g) Security Title of 12(g) Security Property, Plant, and Equipment [Line Items] Property, Plant, and Equipment [Line Items] Fair value of common shares received from disposal of discontinued operation Fair value of common shares received from disposal of discontinued operation Fair value of common shares received from disposal of discontinued operation GERMANY GERMANY Effective Income Tax Rate Reconciliation [Table] Effective Income Tax Rate Reconciliation [Table] Shares issued as options (in shares) impact to Equity Plan Shares Issued as Options, Number Counted Shares Issued as Options, Number Counted Restructuring Reserve, Noncurrent Restructuring Reserve, Noncurrent Interest rate to present value long-term restructuring liability Interest rate to present value long-term restructuring liability Interest rate to present value long-term restructuring liability NBV of property, plant and equipment, net sold NBV of property, plant and equipment, net sold NBV of property, plant and equipment, net sold MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Other long-term assets (note 4) Other Assets, Noncurrent Finance Lease, Liability, Payments, Due Year Three Finance Lease, Liability, to be Paid, Year Three Document Type Document Type Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Blackberry Limited and Summary of Significant Accounting Policies and Critical Accounting Estimates Significant Accounting Policies [Text Block] Litigation Settlement, Amount Awarded from Other Party Litigation Settlement, Amount Awarded from Other Party Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Canada CANADA Debenture total fair value adjustment Debenture total fair value adjustment Debenture total fair value adjustment Deferred income tax liabilities Deferred Tax Liabilities, Gross Patent sale financing component Patent sale financing component Patent sale financing component Increase for income tax positions of current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Income before income tax Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest CEWS and CERS final extension date of program CEWS and CERS final extension date of program CEWS and CERS final extension date of program Cost of property, plant and equipment Property, Plant, and Equipment, before Accumulated Depreciation, Depletion, and Amortization Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Four Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Four New Accounting Pronouncements or Change in Accounting Principle [Table] Accounting Standards Update and Change in Accounting Principle [Table] Net Income (Loss) from Continuing Operations Available to Common Shareholders, Diluted Net Income (Loss) from Continuing Operations Available to Common Shareholders, Diluted Executive Category: Executive Category [Axis] Maturity period of short-term investments Short-term Investment Maturity Period Short-term Investment Maturity Period Transferred at Point in Time [Member] Transferred at Point in Time [Member] Right-Of-Use Assets Disposal, Net Book Value Right-Of-Use Assets Disposal, Net Book Value Right-Of-Use Assets Disposal, Net Book Value Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Acquisition of long-term investments Payments to Acquire Long-Term Investments Supplemental Cash Flow Information [Abstract] Supplemental Cash Flow Information [Abstract] Net change in fair value and amounts reclassified to net income (loss) from derivatives designated as cash flow hedges during the year (note 10) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Federal general tax reduction Federal general tax reduction Federal general tax reduction PEO Name PEO Name Unrealized Losses Cash Cash Equivalents And Investments Unrealized Losses Cash, cash equivalents and investments unrealized losses. Shipping and handling costs Shipping and Handling Cost, Policy [Policy Text Block] Cash Flow Hedges Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Discontinued Operation Result of Operations Discontinued Operation Result of Operations [Table Text Block] Discontinued Operation Result of Operations Income associated with the change in fair value from instrument-specific credit components recorded in AOCL Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, before Tax Property, Plant and Equipment, Type [Axis] Long-Lived Asset, Class [Axis] Facilities reclass - impact to IoT Segment cost of sales Facilities reclass - impact to IoT Segment cost of sales Facilities reclass - impact to IoT Segment cost of sales Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Non-U.S. promissory notes Non Us Government Promissory Notes [Member] Non Us Government Promissory Notes [Member] Revenue recognition Revenue [Policy Text Block] Independent directors annual retainer remaining percentage Independent Directors Annual Retainer Remaining Percentage Independent directors annual retainer remaining percentage. Accounts payable Increase (Decrease) in Accounts Payable Settlement of tax positions Unrecognized Tax Benefits, Increase Resulting from Settlements with Taxing Authorities Other Other Accrued Liabilities, Current Operating leases Operating lease cash flow Operating lease cash flow Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] INDIA INDIA Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Stock-based compensation Share-Based Payment Arrangement, Noncash Expense Tax Period [Axis] Tax Period [Axis] Facilities Reclass - General and administrative Revised Facilities Reclass - General and administrative Revised Facilities Reclass - General and administrative Revised Disposal Group, Including Discontinued Operation, Operating Income (Loss) Disposal Group, Including Discontinued Operation, Operating Income (Loss) Subsegments Consolidation Items [Domain] Subsegments Consolidation Items [Domain] Earnings Per Share, Basic Earnings Per Share, Basic Deferred Revenue Deferred Revenue Intellectual property Intellectual Property [Member] Total current assets Assets, Current Insider Trading Arrangements [Line Items] Short-term debentures Short-Term Debt, Fair Value Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Short-term Lease, Cost Short-Term Lease, Cost Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] Document Annual Report Document Annual Report Accounts Receivable, after Allowance for Credit Loss, Current Accounts Receivable, after Allowance for Credit Loss, Current Revenue Contract Balances [Axis] Revenue Contract Balances [Axis] Revenue Contract Balances [Axis] Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Advertising costs Advertising Cost [Policy Text Block] Volatility Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Maturity period of long-term investments Maturity period of long-term investments Maturity period of long-term investments Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount Investment tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount Recognition of deferred tax assets due to U.S. tax reform Recognition of deferred tax assets due to U.S. tax reform Recognition of deferred tax assets due to U.S. tax reform Other Receivables Greater than Five Percent of Current Assets Other Receivables Greater than Five Percent of Current Assets Other Receivables Greater than Five Percent of Current Assets Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Concentration risk, percentage Concentration Risk, Percentage Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount Deferred revenue, non-current Deferred Revenue, Noncurrent Equity Awards Adjustments Equity Awards Adjustments [Member] Intangible assets Intangible Assets, Finite-Lived, Policy [Policy Text Block] Patent sale variable consideration recognized on sale Patent sale variable consideration recognized on sale Patent sale variable consideration recognized on sale Income Tax Jurisdiction [Domain] Income Tax Jurisdiction [Domain] Revenue classified by timing of recognition [Table] Revenue classified by timing of recognition [Table] Revenue classified by timing of recognition [Table] Debentures Long-Term Debt [Text Block] Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Five Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Five Entity Address, Country Entity Address, Country Cancelled during the period, Number Forfeited during the period, Number Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period 12 to 24 months 12 to 24 months [Member] 12 to 24 months [Domain] General and administrative General and Administrative Expense Treasury stock - share repurchase Treasury stock - share repurchase Treasury stock - share repurchase Cost of property, plant and equipment, net, sold Cost of property, plant and equipment, net, sold Cost of property, plant and equipment, net, sold Inducement award expense (recovery) Inducement award expense (recovery) Inducement award expense (recovery) Transaction price allocated to the remaining performance obligations [Line Items] Transaction price allocated to the remaining performance obligations [Line Items] [Line Items] for Transaction price allocated to the remaining performance obligations [Table] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Software maintenance revenue term Software maintenance revenue term - IoT Software maintenance revenue term - IoT Class of Stock [Domain] Class of Stock [Domain] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Unrealized Gains Cash Cash Equivalents And Investments Unrealized Gains Cash, cash equivalents and investments unrealized gains. Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Government Subsidies, Policy Government Subsidies, Policy [Policy Text Block] Government Subsidies, Policy Investments Investment, Policy [Policy Text Block] Income Tax Jurisdiction [Axis] Income Tax Jurisdiction [Axis] Discontinued Operations and Disposal Groups [Abstract] Income Taxes Income Tax Disclosure [Text Block] Cash and Cash Equivalent [Table] Cash and Cash Equivalent [Table] Accounts payable Accounts Payable, Current Facilities Reclass - Gross Margin Revised Facilities Reclass - Gross Margin Revised Facilities Reclass - Gross Margin Revised Facilities Reclass - Cost of Sales Revised Facilities Reclass - Cost of Sales Revised Facilities Reclass - Cost of Sales Revised Other Other Noncash Income (Expense) Lessee, Operating Lease, Liability, Payments, Due Year Five Lessee, Operating Lease, Liability, to be Paid, Year Five Contractual Maturities of Available-for-Sale Investments Available For Sale Securities Debt Maturities Table [Text Block] Available For Sale Securities Debt Maturities. Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Entity Filer Category Entity Filer Category Patent sale consideration in the form of potential future royalty Patent sale consideration in the form of potential future royalty Patent sale consideration in the form of potential future royalty Short-term Investments Short-Term Investments Value of deferred share units redeemed for shares Value of deferred share units redeemed for shares Value of deferred share units redeemed for shares Purchase price adjustment on cash consideration from disposal of disc. op Purchase price adjustment on cash consideration from disposal of disc. op Purchase price adjustment on cash consideration from disposal of disc. op Advertising expense Advertising Expense Number of awards granted Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures Effective Income Tax Rate Reconciliation, Tax Credit Owing, Investment, Amount Effective Income Tax Rate Reconciliation, Tax Credit Owing, Investment, Amount Effective Income Tax Rate Reconciliation, Tax Credit Owing, Investment, Amount Stock-based compensation plans Compensation Related Costs, Policy [Policy Text Block] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Effective Income Tax Rate Reconciliation, Prior Period Adjustment Effective Income Tax Rate Reconciliation, Prior Period Adjustment Effective Income Tax Rate Reconciliation Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Concentration Risk % [Domain] Concentration Risk % [Domain] [Domain] for Concentration Risk % Outstanding at the end of the period, Number Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number Summary of Open Tax Years by Major Jurisdiction Summary Of Open Tax Years By Major Jurisdiction Table [Text Block] Summary of open tax years by major jurisdiction. Revenue recognized on patent sale Revenue recognized on patent sale Revenue recognized on patent sale Stock, Class of Stock [Table] Stock, Class of Stock [Table] Government Assistance, Asset, Current Government Assistance, Asset, Current Current Assets, Current [Abstract] Nokia Corporation [Member] Nokia Corporation [Member] Nokia Corporation [Member] Foreign currency translation Foreign Currency Transactions and Translations Policy [Policy Text Block] Entity Address, Address Line One Entity Address, Address Line One Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Right-of-Use Asset Obtained in Exchange for Operating Lease Liability North America North America [Member] Vested during the period, Weighted-Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Provision for income taxes (note 6) Income Tax Expense (Benefit) Comprehensive income (loss) Comprehensive Income, Policy [Policy Text Block] Restricted cash and cash equivalents (note 4) Restricted Cash and Investments KOREA, REPUBLIC OF KOREA, REPUBLIC OF Proceeds from Legal Settlements Proceeds from Legal Settlements Adoption of Accounting Policies Accounting Standards Update and Change in Accounting Principle [Text Block] Amount of options that will vest on monthly basis after Year 1 Amount of options that will vest on monthly basis after Year 1 Amount of options that will vest on monthly basis after Year 1 Interest rate in event of default Debt Instrument, Interest Rate in Event of Default Debt Instrument, Interest Rate in Event of Default Bank balances Demand Deposits [Member] Disposal Group, Including Discontinued Operation, Goodwill Disposal Group, Including Discontinued Operation, Goodwill Statement [Table] Statement [Table] Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] Share-based Payment Arrangement, Tranche Two [Member] Share-Based Payment Arrangement, Tranche Two [Member] Outstanding RSUs In-the-Money Outstanding RSUs In-the-Money Outstanding Restricted Stock Units In-the-Money Cash received from stock options Proceeds from Stock Options Exercised Value Pre-combination service of replacement awards included in purchase consideration Pre-combination service of replacement awards included in purchase consideration, SE Pre-combination service of replacement awards included in purchase consideration, SE Transaction Price Allocated to the Remaining Performance Obligation Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Par value of convertible debentures Debt Conversion, Converted Instrument, Amount Withholding tax on unremitted earnings Deferred Tax Liabilities Withholding Tax on Unremitted Earnings Deferred Tax Liabilities Withholding Tax on Unremitted Earnings Facilities Reclass - IoT Segment COS Revised Facilities Reclass - IoT Segment COS Revised Facilities Reclass - IoT Segment COS Revised Litigation Settlement, Fee Expense - CAD Currency Litigation Settlement, Fee Expense - CAD Currency Litigation Settlement, Fee Expense - CAD Currency Canadian Current Federal Tax Expense (Benefit)