Impact of foreign exchange Foreign exchange Foreign Exchange Refers to amount of impact of foreign exchange from financing activities during the period. Gain on repurchase of debt Gain on repurchase of debt Gain on Repurchase of Debt Represent the amount of gain on repurchase of debt. Indebtedness [Member] Indebtedness Member Cash inflows Inflows Of Cash From Financing Activities Refers to amount of cash inflows from financing activities during the period. Interest accrued Interest Accrued Interest accrued Non-cash addition Noncash Additions The amount of non-cash additions . Non-cash transfer from deferred charges to indebtedness of debt issue costs and warrants Noncash Transfer From Deferred Charges To Indebtedness Of Debt Issue Costs And Warrants Non-cash transfer from deferred charges to indebtedness of debt issue costs and warrants. Non-cash transfer Noncash Transfers From Financing Activities Represents the amount of non-cash transfers from financing activities during the period. Cash outflows Outflows Of Cash From Financing Activities Refers to amount of cash outflow from financing activities during the period. Satellite performance incentive payments [Member] Satellite performance incentive payments [Member] Satellite Performance Incentive Payments Member Schedule Of Reconciliation Of The Liabilities Arising From Financing Activities Abstract Schedule of Reconciliation of the Liabilities Arising from Financing Activities [Line Items] Supplemental Cash Flow Information - Schedule of Reconciliation of the Liabilities arising from Financing Activities (Details) [Table] Financial assets Adjustments for decrease (increase) in financial assets held for trading Other assets Adjustments for decrease (increase) in other assets Trade and other receivables Adjustments for decrease (increase) in trade accounts receivable Financial liabilities Adjustments for increase (decrease) in financial liabilities held for trading Other liabilities Adjustments for increase (decrease) in other liabilities Operating assets and liabilities Operating assets and liabilities Adjustments For Decrease Increase In Operating Assets And Liabilities Adjustments for decrease (increase) in other operating assets and liabilities to reconcile profit (loss) to net cash flow from (used in) operating activities. Schedule of Non-Cash Investing Activities [Abstract] Satellites, property and other equipment Noncash Activities Related To Satellites Property And Other Equipment The amount of non-cash activities related to satellites, property and other equipment. Schedule Of Off Balance Sheet Contractual Obligations Abstract 2029 [Member] Later than three years and not later than four years [Member] Later than three years and not later than four years [member] 2030 [Member] Later than four years and not later than five years [Member] Later than four years and not later than five years [member] Thereafter [Member] Later than five years [Member] Later than five years [member] Property, plant and equipment by operating lease status [axis] Property, plant and equipment by operating lease status [domain] Property leases [Member] Property Leases Member Trade and other payables Adjustments for increase (decrease) in trade and other payables Commitments and Contingent Liabilities - Schedule of Off-Balance Sheet Contractual Obligations (Details) [Table] Maturity [axis] Maturity [domain] Remaining 2026 [Member] Remaining 2026 [Member] Not later than one year [Member] Not later than one year [member] 2027 [Member] Later than one year [Member] Later than one year and not later than two years [member] 2028 [Member] Later than two years and not later than three years [Member] Later than two years and not later than three years [member] Capital commitments [Member] Capital Commitments Member Other operating commitments [Member] Other Operating Commitments Member Schedule of Off-Balance Sheet Contractual Obligations [Line Items] Contractual obligations Contractual capital commitments Schedule of Net Change in Operating Assets and Liabilities [Abstract] Commitments and Contingent Liabilities [Abstract] Commitments and Contingent Liabilities (Details) [Table] Categories of related parties [axis] Categories of related parties [domain] PSP [Member] PSPMember Contributions made to defined benefit pension plans Post-employment benefit expense, defined contribution plans Contribution amount Post-employment benefit expense in profit or loss, defined benefit plans, operating Entity Central Index Key Entity Central Index Key Document Type Document Type Document Fiscal Year Focus Document Fiscal Year Focus Commitments and Contingent Liabilities [Line Items] Unavoidable present Defined benefit obligation, at present value Customer prepayments Prepayments Defense costs (in Dollars) Income from fines and penalties, operating Interest and penalties Interest And Penalties The amount of interest and penalties. Related Party Transactions [Abstract] Entity File Number Entity File Number Entity Registrant Name Entity Registrant Name Amendment Flag Amendment Flag Document Period End Date Document Period End Date Net income (loss) attributable to: Profit (loss), attributable to [abstract] Telesat Corporation shareholders Net income (loss) attributable to Telesat Corporation Shares Profit (loss), attributable to owners of parent Non-controlling interest Profit (loss), attributable to non-controlling interests Net income (loss) Net income (loss) Profit (loss) Net income (loss) per common share attributable to Telesat Corporation shareholders Earnings Per Share [Abstract] Profit or Loss [Abstract] Revenue Revenue Operating expenses Operating expenses Operating expenses Operating expense, operating Depreciation Depreciation Depreciation expense, operating Amortization Amortization Amortisation expense Other operating gains (losses), net Other operating gains (losses), net Other gains (losses) Operating income Profit (loss) from operating activities Other current financial assets Other current financial assets Current income tax recoverable Current tax assets, current Prepaid expenses and other current assets Current prepayments and other current assets Total current assets Current assets Satellites, property and other equipment Property, plant and equipment Deferred tax assets Deferred tax assets Other long-term financial assets Other non-current financial assets Other current financial liabilities Other current financial liabilities Other current financial liabilities Income taxes payable Current tax liabilities, current Other current liabilities Other current liabilities Current indebtedness Less: current indebtedness Current borrowings Total current liabilities Current liability Current liabilities Long-term indebtedness Ending balance Beginning balance Non-current portion of non-current borrowings Deferred tax liabilities Deferred tax liabilities Total Telesat Corporation shareholders’ equity Equity attributable to owners of parent Non-controlling interest Non-controlling interests Total shareholders’ equity Balance Balance Equity Total liabilities and shareholders’ equity Equity and liabilities (Gain) loss on change in fair value of financial instruments Adjustments for fair value losses (gains) (Gain) loss on disposal of assets Adjustments for losses (gains) on disposal of non-current assets Impairment Goodwill impairment loss Adjustments for impairment loss recognised in profit or loss, goodwill Total Weighted Average Telesat Corporation Shares Outstanding Weighted average ordinary shares used in calculating basic and diluted earnings per share [abstract] Basic (in Shares) Basic total weighted average number of Telesat Corporation Shares outstanding Weighted average number of ordinary shares used in calculating basic earnings per share Diluted (in Shares) Diluted total weighted average number of Telesat Corporation Shares outstanding Weighted average number of ordinary shares used in calculating diluted earnings per share Comprehensive Income [Abstract] Telesat Corporation shareholders Other comprehensive income, net of tax, exchange differences on translation of foreign operations Non-controlling interest Comprehensive income, attributable to non-controlling interests Total comprehensive income, net Comprehensive income, attributable to owners of parent Consolidated Statements of Changes in Shareholders’ Equity [Abstract] SHAREHOLDERS’ EQUITY Statement of changes in equity [table] Total Telesat Corporation shareholders’ equity Parent [member] Non- controlling Interest Non-controlling interests [Member] Non-controlling interests [member] Components of equity [domain] Statement of changes in equity [line items] Issuance of share capital on settlement of restricted share units, performance share units, and the exercise of stock options Issue of equity SHARE CAPITAL Disclosure of share capital, reserves and other equity interest [text block] Non-Controlling Interest [Abstract] NON-CONTROLLING INTEREST Disclosure of non-controlling interests [text block] Share-Based Compensation Plans [Abstract] SHARE-BASED COMPENSATION PLANS Disclosure of share-based payment arrangements [text block] FINANCIAL INSTRUMENTS Disclosure of derivative financial instruments [text block] Employee Benefit Plans [Abstract] Schedule of Basic and Diluted Per Share Disclosure of earnings per share [text block] Schedule of Contractual Maturities of Financial Liabilities Disclosure of maturity analysis for derivative financial liabilities [text block] Schedule of Interest Payable and Interest Payments Disclosure Of Detailed Information About Interest Payable And Interest Payments Explanatory The disclosure of detailed information about interest payable and interest payments explanatory. Schedule of Financial Assets and Financial Liabilities Disclosure of fair value measurement of assets [text block] CAPITAL DISCLOSURES Disclosure of classes of share capital [text block] Financial Instruments [Abstract] COMMITMENTS AND CONTINGENT LIABILITIES Disclosure of commitments and contingent liabilities [text block] RELATED PARTY TRANSACTIONS Disclosure of related party [text block] Future Changes in Accounting Policies Disclosure of changes in accounting policies [text block] Segment Information [Abstract] Schedule of Interest Expense Disclosure Of Interest Expenses Text Block Tabular disclosure of interest expenses. Schedule of Other Operating Gains (Losses), Net [Abstract] Schedule of Other Operating Gains (Losses), Net Disclosure Of Other Operating Gains Losses Net Table Text Block Tabular disclosure of other operating gains (losses),net. Income Taxes [Abstract] Schedule of Income Tax Expense Disclosure of tax receivables and payables [text block] Schedule of Reconciliation of the Statutory Income Tax Rate Schedule Of Reconciliation Of The Statutory Income Tax Rate Table Text Block Disclosure of reconciliation of the statutory income tax rate. Share Capital (Tables) [Table] Counterparty Name [Axis] Counterparty Name [Domain] Telesat Public Shares [Member] Telesat Public Shares Member LP Units [Member] Limited Partnership Units [Member] Limited Partnership Units Member Share Capital [Line Items] Schedule of Number of Shares and Stated Value of the Outstanding Shares [Line Items] Schedule of Number of Shares and Stated Value of the Outstanding Shares Schedule Of Number Of Shares And Stated Value Of Outstanding Shares Schedule of number of shares and stated value of outstanding shares. Interest expense Interest expense Interest expense Interest expense Gain (loss) on change in fair value of financial instruments Gains (losses) on change in fair value of derivatives Interest and other income Interest (income) expense Interest income (expense), operating Gain (loss) on foreign exchange Gains (losses) on exchange differences on translation of foreign operations, before tax Income (loss) before income taxes Income (loss) before income taxes Profit (loss) before tax Tax (expense) recovery Tax (expense) recovery Tax expense (recovery) Income tax expense (income), income taxes Basis of Presentation and Going Concern [Abstract] Basis of Presentation and Going Concern (Details) [Table] Segment Information (Details) [Table] Major customers [axis] Major customers [domain] Two Significant Customers [Member] Two Significant Customers Member One Significant Customers [Member] One Significant Customers Member Schedule of Off-Balance Sheet Contractual Obligations Disclosure of performance obligations [text block] Schedule of CODM and the Reconciliation Thereof to the Net Income (Loss) [Line Items] Schedule of Equipment Sales [Line Items] Share Capital [Abstract] Share-based compensation Expense from share-based payment transactions Schedule of Percentage of Face Value of the Indebtedness Disclosure Of Detailed Information About Rates Used Tt Calculate Fair Value Of Indebtedness Explanatory The Disclosure of detailed information about rates used Tt calculate fair value of indebtedness explanatory. Schedule of Value of the Telesat Financing Warrants Disclosureof Fair Value Movementsin Telesat Lightspeed Financing Warrants Explantoryl Represent the entire tabular disclosure of fair value movements in telesat lightspeed financing warrants. Schedule of Interest Paid, Net of interest Received Schedule Of Interest Paid Net Of Interest Received Table Text Block Tabular column of interest paid net of interest received. Schedule of Reconciliation of the Liabilities Arising from Financing Activities Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities Explanatory Table Text Block Tabular disclosure of reconciliation of liabilities arising from financing activities. Schedule of Net Change in Operating Assets and Liabilities Disclosure Of Detailed Information About Net Change In Operating Assets And Liabilities Explanatory Table Text Block The detailed information about net change in operating assets and liabilities explanatory Schedule of Non-Cash Investing Activities Disclosure Of Detailed Information About Noncash Investing And Financing Activities Explanatory Table Text Block The detailed information about non cash investing and financing activities explanatory. Non-adjusting events after reporting period [domain] Forecast [Member] Ranges of exercise prices for outstanding share options [axis] Carrying amount [member] Carrying amount [Member] Carrying Amount1 Member Classes of financial liabilities [axis] Classes of financial liabilities [domain] Contractual cash flows (undiscounted) [Member] Contractual Cash Flowsundiscounted Member Class C [Member] Class C Shares [Member] Class CCommon Shares Member Golden Share [Member] Golden Share Member Types of antidilutive instruments [axis] Types of antidilutive instruments [domain] RSUs [Member] Restricted share units [member] Effect of diluted securities Dilutive effect of share options on weighted average number of ordinary shares Schedule of Capital [Abstract] Shareholders’ equity (excluding reserves) Shareholders Equityexcluding Reserves Amount of shareholders equity excluding reserves. 2030 [Member] Later than three years and not later than five years [member] Schedule of Maturity of Financial Assets [Line items] Cash and cash equivalents Cash and cash equivalents if different from statement of financial position Trade and other receivables, excluding deferred receivables Trade and other non-current receivables Deferred receivables Deferred Receivable Represent the amount of deferred receivables. Operating Expenses [Abstract] RSUs with Time Criteria [Member] RSUs With Time Criteria Member PSUs with Time and Performance Criteria [Member] RSUSWith Time And Performance Criteria Member Schedule of Movement in Share Units [Line Items] RSUs with time criteria, beginning balance RSUs with time criteria, Ending balance Restricted Share Units With Time Criteria Outstanding The RSUs with time criteria, beginning balance. PSUs with time and performance criteria, Beginning balance PSUs with time and performance criteria, Ending balance PSUs With Time And Performance Criteria The PSUs with time and performance criteria, beginning balance. DSUs, Beginning balance DSUs, Ending balance Deferredd Stock Units DSUs, beginning balance. RSUs with time criteria, Granted Restricted Share Units With Time Criteria Granted RSUs with time criteria, granted. PSUs with time and performance criteria, Granted PSUs With Time And Performance Criteria Granteds The PSUs with time and performance criteria, granted. DSUs, Granted Deferred Stock Granted Deferred stock granted. RSUs with time criteria, Settled Number Of Instruments Other Equity Instrumentssettled RSUs with time criteria, Settled. PSUs with time and performance criteria, Settled PSUs With Time And Performance Criteria Settled The PSUs with time and performance criteria, settled. Schedule of Contractual Maturities of Financial Liabilities [Line items] Schedule of Interest Payable and Interest Payments [Line Items] Total contractual maturities of financial liabilities Gross loan commitments Other Operating Gains (Losses), Net (Details) [Table] Other Operating Gains (Losses), Net [Line Items] Impairment loss Impairment Impairment loss GEO [Member] GEO [Member] GEO [Member] LEO [Member] LEO [Member] LEO [Member] Equipment sales Revenue from sale of telecommunication equipment Schedule Of Geographic Regions Abstract Segment Information - Schedule of Geographic Regions (Details) [Table] All Others [Member] All Others Member Schedule of Geographic Regions [Line Items] Intangible assets Intangible assets other than goodwill Other long-term assets Other non-current non-financial assets Schedule of Interest Expense [Abstract] Interest on indebtedness Interest expense on borrowings Interest on significant financing component Interest On Significant Financing Component Interest on significant financing component. Interest on leases Interest expense on lease liabilities, financing Interest on satellite performance incentive payments Interest On Satellite Performance Incentive Payments Interest on satellite performance incentive payments. Schedule of Indebtedness [Line Items] Class B LP Units [Member] Class BLPUnits Member Class C LP Units [Member] Class CLPUnits Member Number of shares Number of options Outstanding, Beginning Balance (in Shares) Number of options Outstanding, Ending Balance (in Shares) Number of shares outstanding Stated value Share capital Issued capital Time Vesting Option Plans [Member] Time Vesting Option Plans Member Performance Vesting Option Plans [Member] Performance Vesting Option Plans Member Schedule of Number of Time Vesting Stock Options Outstanding and their Weighted Average Exercise Price [Line Items] Schedule Of Movement In Share Units Abstract Share-Based Compensation Plans - Schedule of Movement in Share Units (Details) [Table] Types of share-based payment arrangements [axis] Omnibus Plan [Member] Omnibus Plan Member Goodwill and Intangible Assets [Abstract] Goodwill and Intangible Assets (Details) [Table] Range [axis] Range [domain] Top of range [member] Top of range [Member] Top of range [member] Bottom of range [member] Bottom of range [Member] Bottom of range [member] Goodwill and Intangible Assets [Line Items] Indebtedness (Details) [Table] Debt Instruments [Axis] Debt Instruments Axis DebtInstrumentsDomain [Domain] Senior Secured Credit Facilities [Member] Senior Secured Credit Facilities Member Term Loan B — U.S. Facility [Member] Term Loan B – U.S. Facility [Member] Term Loan BUSFacility Member 6.5% Senior Notes [Member] Six Point Five Percent Senior Notes Member Indebtedness [Line Items] Revolving credit facility (in Dollars) Revolving Credit Facility The value of revolving credit facility. Credit exposure (in Dollars) Credits Exposure The amount of exposure to loss resulting from credit risk. Senior unsecured notes issued (in Dollars) Total Borrowings Loan interest rate Rate percentage Borrowings, interest rate Borrowings maturity date, description Borrowings Maturity Date Description Borrowings maturity date, description. Repurchased principal amount (in Dollars) Repurchased Principal Amount Represent the amount of repurchased principal amount. Class A [Member] Class A Common Shares [Member] Class ACommon Shares Member Class B [Member] Class BCommon Shares Member Non-recurring items Nonrecurring Items The amount of non recurring items. Operating income Revenue and other operating income Capital expenditures Capital Expenditures The amount of capital expenditure. Schedule Of Equipment Sales Abstract Segment Information - Schedule of Equipment Sales (Details) [Table] Segments [axis] Segments [domain] Geographical areas [axis] Geographical areas [domain] Canada [Member] CANADA United States [Member] UNITED STATES Europe, Middle East & Africa [Member] Europe Middle East Africa Member Latin America & Caribbean [Member] Latin America Caribbean Member Asia & Australia [Member] Asia Australia Member United Kingdom [Member] UNITED KINGDOM Schedule of Operating Expenses [Abstract] Compensation and employee benefits Amount expensed Employee benefits expense Other operating expenses Other operating income (expense) Cost of third-party satellites Cost Of Thirdparty Satellites Cost of third-party satellites. Cost of equipment sales Cost of sales Telesat GEO Financing Telesat Geo Financing Abstract Borrowings before deferred financing costs Indebtedness Borrowings Before Deferred Financing Costs The amount of borrowings including deferred financing costs, interest rate floors, prepayment options and premiums. Deferred financing costs, prepayment options, warrants and loss on repayment Deferred Financing Costs Prepayment Option And Loss On Repayment Deferred financing costs, prepayment options and loss on repayment. Risk percentage Description of concentrations of risk Allowance for doubtful accounts Trade And Other Current Receivables Allowance For Doubtful Accounts Trade and other current receivables allowance for doubtful accounts Borrowings before deferred financing costs Borrowings Before Deferred Financing Cost Borrowings before deferred financing cost Derivative liabilities Beginning balance Ending balance Non-current derivative financial liabilities Deferred charges Deferred Charges This value for deferred charges. Other [Member] Other Member Broadcast [Member] Broadcast Member Enterprise [Member] Enterprise Member Insurance proceeds and other Insurance Proceeds And Other Insurance proceeds and other. Income (loss) before tax Profit (loss) before financing and income taxes Multiplied by the statutory income tax rates Applicable tax rate Statutory income tax rate Statutory Income Tax Rate The statutory income tax rate. Income tax recorded at rates different from the Canadian tax rate Income Tax Recorded At Rates Different From Canadian Tax Rate The amount of different tax rate being used from a different jurisdiction. Permanent differences Deferred Tax Expense Income Related To Permanent Differences The amount of deferred tax expense or income relating to permanent differences. Effect of temporary differences not recognised as deferred tax assets Deferred tax expense (income) relating to origination and reversal of temporary differences Lease Liabilities - Schedule of Expected Undiscounted Contractual Cash Flows of the Lease Liabilities (Details) [Table] Schedule Of Indebtedness Abstract Indebtedness - Schedule of Indebtedness (Details) [Table] 2027 Senior Unsecured Notes [Member] Two Thousand Twenty Seven Senior Unsecured Notes Member 2026 Senior Secured Notes [Member] Two Thousand Twenty Six Senior Secured Notes Member Schedule Of Number Of Shares And Stated Value Of The Outstanding Shares Abstract Share Capital - Schedule of Number of Shares and Stated Value of the Outstanding Shares (Details) [Table] Classes of share capital [axis] Classes of share capital [domain] Schedule Of Number Of Time Vesting Stock Options Outstanding And Their Weighted Average Exercise Price Abstract Share-Based Compensation Plans - Schedule of Number of Time Vesting Stock Options Outstanding and their Weighted Average Exercise Price (Details) [Table] Historic Plan [Member] Historic Plan Member Weighted average exercise price Outstanding, Beginning Balance Weighted average exercise price Outstanding, Ending Balance Weighted average exercise price of share options outstanding in share-based payment arrangement Number of options, Exercised Stock option exercised Number of share options exercised in share-based payment arrangement Weighted average exercise price, Exercised Weighted average exercise price of share options exercised in share-based payment arrangement Ranges of exercise prices for outstanding share options [domain] Satellites, Property and Other Equipment [Abstract] Primarily related to acquisitions associated Additions from acquisitions, investment property Percentage of discount rate Percentage Of Discount Rate Of Goodwill Impairment Percentage of discount rate of goodwill impairment. Lease Liabilities [Abstract] Undiscounted total Undiscounted operating lease payments to be received Indebtedness [Abstract] Telesat Lightspeed Financing Warrants [Member] Telesat Lightspeed Financing Warrants Member Telesat Lightspeed Financing [Member] Telesat Lightspeed Financing Member Sale of Stock [Axis] Sale Of Stock Axis SaleOfStockDomain [Domain] 2027 Senior Secured Notes [Member] Two Thousand Twenty Seven Senior Secured Notes Member Open market purchases Open Market Purchases Open-market operation, any of the purchases and sales of government securities and sometimes commercial paper by the central banking authority for the purpose of regulating the money supply and credit conditions on a continuous basis. Payments for debt issue costs Government of Canada [Member] Government Of Canada Member Government of Quebec [Member] Government Of Quebec Member Warrants and rights outstanding terms Warrants And Rights Outstanding Terms Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. DSUs, Forfeited Deferred Stock Forfeited Number of forfeited share. RSUs with time criteria, Forfeited Restricted Share Units With Time Criteria Forfeited Number of restricted share units with time criteria forfeited. PSUs with time and performance criteria, Forfeited PSUs With Time And Performance Criteria Forfeited The PSUs with time and performance criteria, forfeited. Stock options granted Number of share options granted in share-based payment arrangement Types of share-based payment arrangements [domain] DSUs [Member] PSUs [Member] Percentage of goodwill impairment loss Percentage of Goodwill Impairment Loss Percentage of goodwill impairment loss. Foreign Exchange Risk [Member] Foreign exchange risk [Member] Undiscounted contractual interest payments Interest payable Gain (loss) on disposal of assets Net gains (losses) on disposals of non-current assets Trade and other payables [Member] Trade And Other Payables Member Customer and other deposits [Member] Customer And Other Deposits Member Trade and other payables Trade and other payables Other long-term financial liabilities Other long-term financial liabilities Included in other long-term liabilities Other non-current financial liabilities Total Assets (liabilities) 2026 Senior Secured Notes [Member] Two Thousand And Twenty Six Senior Secured Notes Member Schedule of Percentage of Face Value of the Indebtedness [Line Items] Term Loan Percentageoffairvalueindebtedness Percentage of fair value indebtedness. Schedule Of Movements In Telesat Lightspeed Financing Warrants Abstract Change in fair value Change In Fair Value Of Financing Warrants Amount of change in fair value of financing warrants. Impact of foreign exchange Net foreign exchange loss Schedule Of Expenses Included On The Condensed Consolidated Statements Of Income Loss Abstract Other Post-employment Benefit Plans US [Member] Other Postemployment Benefit Plans USMember Other Post-employment Benefit Plans Total [Member] Other Postemployment Benefit Plans Total Member Schedule of Expenses Included on the Condensed Consolidated Statements of Income (Loss) [Line Items] Derivative Liabilities [Member] Derivative Liabilities Member Other financial liabilities [Member] Other Financial Liabilities Member Schedule Of Interest Payable And Interest Payments Abstract Financial Instruments - Schedule of Interest Payable and Interest Payments (Details) [Table] Schedule Of Financial Assets And Financial Liabilities Abstract Financial Instruments - Schedule of Financial Assets and Financial Liabilities (Details) [Table] Classes of financial assets [axis] Classes of financial assets [domain] Fair value [Member] Financial assets at fair value, class [member] Interest paid Interest paid, classified as financing activities Interest received Interest received, classified as operating activities Interest paid, net of interest received Interest Paid Net Of Interest Received Interest paid, net of interest received. Classes of financial instruments [domain] Borrowings by name [domain] Defined benefit plans [domain] Schedule Of Contractual Maturities Of Financial Liabilities Abstract Financial Instruments - Schedule of Contractual Maturities of Financial Liabilities (Details) [Table] Schedule Of Percentage Of Face Value Of The Indebtedness Abstract Financial Instruments - Schedule of Percentage of Face Value of the Indebtedness (Details) [Table] Borrowings by name [axis] 2027 Senior Unsecured Notes [Member] Two Thousand And Twenty Seven Senior Unsecured Notes Member Events After the Reporting Period [Abstract] Disclosure of non-adjusting events after reporting period [table] Lease liabilities [Member] Lease liabilities [member] Amortisation of deferred financing costs, prepayment options, warrants and loss on repayment Amortisation Of Deferred Financing Costs Prepayment Options And Loss On Repayment Refers to amount of amortization of deferred financing costs, interest rate floor and prepayment option from financing activities during the period. Document Fiscal Period Focus Document Fiscal Period Focus Current Fiscal Year End Date Current Fiscal Year End Date Scientific research and experimental development Research and development expense Outstanding percentage The amount of percentage of outstanding. Cover [Abstract] Document Information [Table] Document Information [Line Items] Other comprehensive income (loss), net of tax (expense) Reserve of gains and losses on financial assets measured at fair value through other comprehensive income Share-based compensation, net of tax (expense) Sharebased Compensation Net Of Taxexpense Represents the amount of share-based compensation, net of tax (expense). Statement of financial position [abstract] ASSETS Assets [abstract] Cash and cash equivalents Cash and cash equivalent Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Cash and cash equivalents Cash and cash equivalents Trade and other receivables Trade and other current receivables Long-term income tax recoverable Current tax assets, non-current Other long-term assets Included in other long-term assets Other non-current assets Goodwill Goodwill Total assets Assets LIABILITIES Liabilities [abstract] Trade and other payables Trade and other current payables Other long-term liabilities Other non-current liabilities Total liabilities Liabilities Accumulated earnings Retained earnings Reserves Capital reserve Adjustments to reconcile net income (loss) to cash flows from operating activities: Adjustments to reconcile operating profit (loss) [abstract] Depreciation Adjustments for depreciation expense Amortization Adjustments for amortisation expense Tax expense (recovery) Adjustments for income tax expense Interest expense Adjustments for interest expense Interest income Adjustments for interest income Items that may be reclassified into profit or loss Components of other comprehensive income that will be reclassified to profit or loss, net of tax [abstract] Foreign currency translation adjustments Gains (losses) on change in value of foreign currency basis spreads, net of tax Total other comprehensive income (loss) Other comprehensive income (loss), net of tax (expense) recovery Other comprehensive income Total comprehensive income (loss) Comprehensive income Total comprehensive income (loss) attributable to: Comprehensive income attributable to [abstract] Components of equity [axis] Telesat Corporation Shares Ordinary shares [member] Accumulated earnings Retained earnings [member] Equity- settled employee benefits reserve Reserve of remeasurements of defined benefit plans [member] Foreign currency translation reserve Reserve of exchange differences on translation [member] Total reserves Other reserves [member] Exchange of Limited Partnership units for Telesat Public Shares Stock Issued During Period Value Of Exchange Of Limited Partnership Units For Public Shares The amount of exchange of limited partnership units for public shares. Share-based compensation Increase (decrease) through share-based payment transactions, equity Interest and other income Other income (expense) from subsidiaries, jointly controlled entities and associates Gain (loss) on changes in fair value of financial instruments Cumulative gain (loss) previously recognised in other comprehensive income arising from reclassification of financial assets out of fair value through other comprehensive income into fair value through profit or loss measurement category Gain (loss) on foreign exchange (Gain) loss on foreign exchange Foreign exchange gain (loss) Basic (in Dollars per share) Basic earnings (loss) per share Diluted (in Dollars per share) Diluted earnings (loss) per share EMPLOYEE BENEFIT PLANS Disclosure of employee benefits [text block] Supplemental Cash Flow Information [Abstract] SUPPLEMENTAL CASH FLOW INFORMATION Disclosure of cash flow statement [text block] Schedule of CODM and the Reconciliation Thereof to the Net Income (Loss) Disclosure of products and services [text block] Schedule of Equipment Sales Disclosure Of Schedule Of Equipment Sales Table Text Block Disclosure of schedule of equipment sales. Schedule of Geographic Regions Disclosure of geographical areas [text block] Schedule of Operating Expenses Schedule Of Operating Expenses Table Text Block Disclosure of operating expenses. Interest Expense [Abstract] Schedule of Expected Undiscounted Contractual Cash Flows of the Lease Liabilities Disclosure of maturity analysis of operating lease payments [text block] Schedule of Indebtedness Disclosure of detailed information about borrowings [text block] Schedule of Activity in Deferred Financing Charges Schedule Of Activity In Deferred Financing Charges Table Text Block Tabular disclosure for activity in deferred financing charges. Liquidity [Axis] Liquidity Axis LiquidityDomain [Domain] Telesat GEO [Member] Telesat GEOMember Basis of Presentation and Going Concern [Line Items] Segment Information [Line Items] Number of operating segments Number Of Operatings Segment Number of operating segment. Revenue percentage Percentage of entity's revenue Cash flows (used in) generated from investing activities Cash flows from (used in) investing activities [abstract] Cash payments related to satellite programs Cash Payments Related To Satellite Programs Represents the amount of cash payments related to satellite programs. Cash payments related to property and other equipment Purchase of property, plant and equipment, classified as investing activities Net proceeds from disposal of assets Proceeds from sales of other long-term assets, classified as investing activities Investments and other Purchase of other long-term assets, classified as investing activities Net cash (used in) generated from investing activities Cash flows from (used in) investing activities Net cash (used in) generated from financing activities Cash flows from (used in) financing activities Effect of changes in exchange rates on cash and cash equivalents Effect of exchange rate changes on cash and cash equivalents Changes in cash and cash equivalents Increase (decrease) in cash and cash equivalents after effect of exchange rate changes Background of the Company [Abstract] SEGMENT INFORMATION Disclosure of entity's operating segments [text block] OPERATING EXPENSES Disclosure of other operating expense [text block] INTEREST EXPENSE Disclosure of interest income (expense) [text block] OTHER OPERATING GAINS (LOSSES), NET Disclosure of other operating income [text block] INCOME TAXES Disclosure of income tax [text block] SATELLITES, PROPERTY AND OTHER EQUIPMENT Disclosure of property, plant and equipment [text block] Schedule of Number of Time Vesting Stock Options Outstanding and their Weighted Average Exercise Price Disclosure of number and weighted average exercise prices of share options [text block] Schedule of Movement in Share Units Schedule Of Number Of Restricted Share Units Outstanding Text Block The tabular disclosure of restricted share units outstanding. Products and services [axis] Products and services [domain] Cash flows from (used in) operating activities [abstract] Share-based compensation Adjustments for share-based payments Deferred revenue amortization Adjustmentsfor Deferred Revenue Amortization Represent the amount of adjustments for deferred revenue amortization. EARNINGS PER SHARE Earnings per share [text block] Government Grant [Abstract] GOVERNMENT GRANT Disclosure of government grants [text block] Capital Disclosures [Abstract] Repurchase of indebtedness Repayments of borrowings EVENTS AFTER THE REPORTING PERIOD Disclosure of events after reporting period [text block] Material Accounting Policy Information [Abstract] Schedule of Maturity of Financial Assets Disclosure of maturity analysis for financial assets held for managing liquidity risk [text block] Schedule of Expenses Included on the Condensed Consolidated Statements of Income (Loss) Disclosure of analysis of other comprehensive income by item [text block] Schedule of Balance Sheet Obligations, Distributed Between Pension and Other Post-Employment Benefits Disclosure of defined contribution plans [text block] Schedule of Cash and Cash Equivalents Disclosure of cash and cash equivalents [text block] Schedule of Income Taxes Paid, Net of Income Taxes Received Disclosure Of Income Taxes Paid Net Of Income Taxes Received Explanatory Tabular disclosure of income taxes paid. net of income taxes received. Pension expense Adjustmentsfor Pension Expense Represent the amount of adjustments for pension expense. Other Other adjustments for non-cash items Income taxes paid, net of income tax received Income taxes paid (refund), classified as operating activities Interest paid, net of interest received Interest paid, classified as operating activities Net cash (used in) generated from operating activities Cash flows from (used in) operating activities Cash flows (used in) generated from financing activities Cash flows from (used in) financing activities [abstract] Proceeds from indebtedness Proceeds from borrowings, classified as financing activities Payments of principal on lease liabilities Payments of lease liabilities, classified as financing activities Satellite performance incentive payments Satellite Performances Incentive Payment Cash outflows related to the payment of satellite performance incentive payments over the lives of certain satellites. Proceeds from exercise of stock options Proceeds from exercise of options Tax withholdings on settlement of restricted and performance share units Tax Withholdings On Settlement Of Restricted And Performance Share Represents the amount of tax withholdings on settlement of restricted and performance share units and exercise of stock options. BACKGROUND OF THE COMPANY Disclosure of general information about financial statements [text block] BASIS OF PRESENTATION AND GOING CONCERN Disclosure of analysis of present value of defined benefit obligation that distinguishes nature, characteristics and risks [text block] MATERIAL ACCOUNTING POLICY INFORMATION Disclosure of material accounting policy information [text block] GOODWILL AND INTANGIBLE ASSETS Disclosure of intangible assets [text block] LEASE LIABILITIES Disclosure of leases [text block] INDEBTEDNESS Disclosure of borrowings [text block] Schedule of Reconciliations of the Denominators of the Basic and Diluted Per Share Disclosure of instruments with potential future dilutive effect not included in calculation of diluted earnings per share [text block] Schedule of Capital Disclosure Of Capital Text Block The tabular disclosure of capital. Finance provided for further source of liquidity Finance Provided for Further Source of Liquidity Amount of finance provided for further source of liquidity. Non-adjusting events after reporting period [axis] Interest on employee benefit plans Interest On Employee Benefit Plans Interest on employee benefit plans. Capitalized interest Interest On Capitalized Interest Capitalized interest. Indebtedness - Schedule of Indebtedness (Parentheticals) (Details) [Table] Indebtedness - Schedule of Activity in Deferred Financing Charges (Details) [Table] Debt issue costs [Member] Debt Issue Costs Member Total [Member] Total Deferred Financing Charges Member Schedule of Activity in Deferred Financing Charges [Line Items] International Customers [Member] International Customers Member Telesat Lightspeed Warrants [Member] Telesat Lightspeed Warrants Member Performance Share Units [Member] Performance Share Units Member Deferred Share Units [Member] Deferred Share Units Member Class A Limited Partnership Units [Member] Class ALimited Partnership Units Member Special voting share Common Stocks Voting Rights Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights. Settlement of restricted stock unit Settlement Of Restricted Stock Unit Settlement of restricted stock unit. Settlement of public shares Settlement Of Public Shares Settlement of public shares. Non-Controlling Interest [Line Items] Economic interest rate Proportion of ownership interests held by non-controlling interests Schedule Of Codm And The Reconciliation Thereof To The Net Income Loss Abstract Segment Information - Schedule of CODM and the Reconciliation Thereof to the Net Income (Loss) (Details) [Table] Consulting and Other [Member] Consulting And Other Member Operating expenses, net of share-based compensation and non-recurring items Operating Expenses Net Of Sharebased Compensation And Nonrecurring Items The amount is for operating expenses. Adjusted EBITDA Adjusted Earnings Before Interest Taxes Depreciationand Amortization The amount of adjusted earnings before interest, taxes, depreciation and amortization. Schedule of Income Tax Expense [Abstract] Current tax expense (recovery) Current tax expense (income), income taxes Deferred tax expense (recovery) Deferred tax expense (income) Schedule of Reconciliation of the Statutory Income Tax Rate [Abstract] Foreign taxes Tax effect of foreign tax rates Effective income tax rate Effective Income Tax Rate The Effective Income Tax Rate. Schedule Of Expected Undiscounted Contractual Cash Flows Of The Lease Liabilities Abstract Schedule of Expected Undiscounted Contractual Cash Flows of the Lease Liabilities [Line items] Lease Liabilities Lease liabilities Government Of Canada Telesat Lightspeed Financing [Member] Government Of Canada Telesat Lightspeed Financing Member Government Of Quebec Telesat Lightspeed Financing [Member] Government Of Quebec Telesat Lightspeed Financing Member Telesat GEO Financing [Member] Telesat GEOFinancing Member Term Loan B – U.S. Facility Payment Of Term Loan Payment of term loan. Senior Notes Senior Notes Amount The senior notes amount. Senior Secured Notes Payments Of Options Senior Secured Notes Senior Secured Notes. Schedule Of Activity In Deferred Financing Charges Abstract Balance Balance Deferred Financing Charges Balance It represents deferred financing charges. Transferred to debt issue costs Transferred To Debt Issue Costs Transferred to debt issue costs. DSUs, Settled Deferred Stock Settled Deferred stock settled. Schedule of Basic and Diluted Per Share [Abstract] Effect of diluted securities Effect Of Diluted Securities Amount of effect of diluted securities. Diluted net income (loss) attributable to Telesat Corporation Shares Profit (loss), attributable to ordinary equity holders of parent entity, used in calculating diluted earnings per share Schedule Of Reconciliations Of The Denominators Of The Basic And Diluted Per Share Abstract Earnings Per Share - Schedule of Reconciliations of the Denominators of the Basic and Diluted Per Share (Details) [Table] Lease liabilities Expense relating to variable lease payments not included in measurement of lease liabilities Performance share units Performance Share Units Number of performance share units. Shares issued Number of shares issued Non-Controlling Interest (Details) [Table] Employee Benefits [Member] Employee benefits [member] Share-Based Compensation Plans [Line Items] Government Grant (Details) [Table] Classes of financial instruments [axis] Financial Instruments (Details) [Table] Interest Rates Floor [Member] Interest Rates Floor Member Customer [Axis] Customer [Domain] North American [Member] North American Member Discount cash flows Discount rate used in current estimate of value in use Nature expenses [domain] Financial Instruments [Line Items] Maximum exposure to credit risk Maximum exposure to credit risk Private Placements [Member] Private Placements Member Repurchase of Principal Amount Repurchase Of Principal Amount Percentage of repurchase of principal amount. Share Capital (Details) [Table] Class B Variable Voting Shares [Member] Class BVariable Voting Shares Member Telesat Public shares Telesat Public Shares Abstract Total Telesat Public shares Break Down Of Telesat Public Shares breakdown of Telesat Public shares. Stock options [Member] Share options [member] Schedule of Reconciliations of the Denominators of the Basic and Diluted Per Share [Line Items] Debt financing (excluding deferred financing costs, prepayment options, warrants and loss on repayment) Debt Financingexcluding Deferred Financing Costs Prepayment Options And Loss On Repayments Debt financing (excluding deferred financing costs, prepayment options and loss on repayment). Schedule Of Maturity Of Financial Assets Abstract Financial Instruments - Schedule of Maturity of Financial Assets (Details) [Table] Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] 2028 [Member] Later than one year and not later than three years [member] Other financial assets Other financial assets Total contractual maturities of financial assets Financial assets Recorded as a reduction (in Dollars) Reduction of issued capital Property and other equipment Other property, plant and equipment Net income loss Net Increase Income Impact of Percent Increase Decrease The net increase income impact of 5 percent increase decrease. Other comprehensive income loss Other Comprehensive Income Loss Impact Of5 Percent Increase Decrease Other comprehensive income loss impact of 5 percent increase decrease Cash and cash equivalents Other differences to cash and cash equivalents in statement of cash flows Discount rate cash flow Discount rate applied to cash flow projections Share-Based Compensation Plans (Details) [Table] Nature expenses [axis] Satellites, Property and Other Equipment [Member] Satellites Property And Other Equipment Member Operating Expenses [Member] Operating Expenses Member Government Grant [Line Items] Non-refundable government contribution value Nonrefundable Government Contribution Value Amount of non-refundable government contribution value. Recorded relating to agreement Recorded Relating To Agreement The recorded relating to agreement. Change in estimates related to prior periods Adjustments for current tax of prior periods Other Other Income Taxes The amount of revenue arising from other income taxes. Excess tax benefits on share-based payments recognised directly in equity Decrease (increase) through tax on share-based payment transactions, equity Debt Exchange Represents the amount of debt exchange. Levels of fair value hierarchy [axis] Levels of fair value hierarchy [domain] Level 1 [Member] Level 1 of fair value hierarchy [member] Level 2 [Member] Level 2 of fair value hierarchy [member] Level 2, Level 3 [Member] Level 2 and 3 of fair value hierarchy [member] Categories of financial assets [axis] Categories of financial assets [domain] Pension Plans Total [Member] Pension Plans Total Member Other Post-employment Benefit Plans Canadian [Member] Other Postemployment Benefit Plans Canadian Member Schedule of Balance Sheet Obligations, Distributed Between Pension and Other Post-Employment Benefits [Line Items] Short-term investments Short-term investments, classified as cash equivalents Schedule of Income Taxes Paid, Net of Income Taxes Received [Abstract] Income taxes paid Income Taxe Paid Income taxes paid. Income taxes received Income Taxes Received Income taxes received. Income taxes paid, net of income tax received Income taxes paid (refund) 2027 Senior Secured Notes [Member] Tow Thousand And Twenty Seven Senior Secured Notes Member Financial Instruments - Schedule of Movements in Telesat Lightspeed Financing Warrants (Details) [Table] Warrants [Axis] Warrants Axis WarrantsDomain [Domain] Schedule of Value of the Telesat Financing Warrants [Line Items] Schedule of Movements in Telesat Lightspeed Financing Warrants [Line Items] Employee Benefit Plans - Schedule of Expenses Included on the Condensed Consolidated Statements of Income (Loss) (Details) [Table] Defined benefit plans [axis] Pension Plans Canadian [Member] Pension Plans Canadian Member Pension Plans US [Member] Pension Plans USMember Schedule Of Balance Sheet Obligations Distributed Between Pension And Other Post Employment Benefits Abstract Employee Benefit Plans - Schedule of Balance Sheet Obligations, Distributed Between Pension and Other Post-Employment Benefits (Details) [Table] Events After the Reporting Period [Line Items] Disclosure of non-adjusting events after reporting period [line items] Third-party borrowings Other borrowings Interest payments Interest Payments The amount of interest payments. Amortized cost [Member] Financial assets at amortised cost, category [member] Fair value through profit or loss [Member] Financial assets at fair value through profit or loss, category [member] Schedule of Financial Assets and Financial Liabilities [Line Items] Trade and other receivables Trade and other receivables Schedule of Cash and Cash Equivalents [Abstract] Cash Cash Schedule of Interest paid, Net of interest Received [Abstract]