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Settlement period, Canadian participants Share-Based Compensation Arrangement By Share-Based Payment Award, Award Settlement Period, Canadian Participants Share-Based Compensation Arrangement By Share-Based Payment Award, Award Settlement Period, Canadian Participants Investments accounted for using equity method Investments accounted for using equity method Reasonably decrease in interest rates of borrowings Reasonably Decrease In Interest Rates Of Borrowings Reasonably Decrease In Interest Rates Of Borrowings Disclosure of transactions between related parties [line items] Disclosure of transactions between related parties [line items] Other comprehensive (loss) income Other comprehensive income [abstract] Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] Canada CANADA Impairment loss (impairment gain and reversal of impairment loss) determined in accordance with IFRS 9 Impairment loss (impairment gain and reversal of impairment loss) determined in accordance with IFRS 9 Classes of share capital [domain] Classes of share capital [domain] Summary of Share based Compensation Disclosure of terms and conditions of share-based payment arrangement [text block] Summary of Total Capital Disclosure Of Total Capital [Table Text Block] Disclosure of detailed information about total capital. 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Summary of Sensitivity Analysis Based on Group's Foreign Currency Financial Instruments Disclosure of nature and extent of risks arising from financial instruments [text block] Second tranche Second Tranche [Member] Second Tranche Accumulated Depreciation Accumulated depreciation, amortisation and impairment [member] Entity Current Reporting Status Entity Current Reporting Status Summary of Deferred Tax Assets and Deferred Tax Liabilities Disclosure of deferred taxes [text block] Interest accretion on balances of purchase price payable Interest Accretion On Balances Of Purchase Payable Interest accretion on balances of purchase payable. Statement of changes in equity [table] Statement of changes in equity [table] Key management personnel of entity or parent [member] Key management personnel of entity or parent [member] First tranche First Tranche [Member] First Tranche Deferred consideration, payout period Deferred Consideration, Payout Period Deferred Consideration, Payout Period Disclosure of classes of share capital [abstract] Amortisation expense Amortisation Expense Since Acquisition Date Amortisation Expense Since Acquisition Date CAD Canada, Dollars Cost of revenues Cost of sales Alithya USA Consulting Services, LLC Alithya USA Consulting Services, LLC [Member] Alithya USA Consulting Services, LLC Current Fiscal Year End Date Current Fiscal Year End Date Borrowings recognised as of acquisition date Borrowings recognised as of acquisition date Bottom of range Bottom of range [member] Disclosure Of Capital Disclosures [Abstract] Disclosure of capital disclosures. Disclosure of major customers [table] Disclosure of major customers [table] Interest accretion Interest Accretion On Balances Of Purchase Payable Since Acquisition Date Interest Accretion On Balances Of Purchase Payable Since Acquisition Date Categories of related parties [axis] Categories of related parties [axis] Loss on disposal of property and equipment, intangible and lease modification Impairment Loss Recognised In Profit Or Loss Property Plant And Equipment And Right Of Used Assets Impairment of Property, Plant and Equipment Including Right-of-Use Assets And Loss on Remeasurement of Lease Liabilities Disclosure of detailed information about borrowings [line items] Disclosure of detailed information about borrowings [line items] Amount Reconciliation of accounting profit multiplied by applicable tax rates [abstract] Net (loss) earnings Net earnings Net (loss) earnings Net (loss) earnings Profit (loss) Accounts Receivable and Other Receivables Benchmark Accounts Receivable and Other Receivables and unbilled revenuesBenchmark [Member] Accounts Receivable and Other Receivables and unbilled revenuesBenchmark Financial assets Financial assets Property and equipment Property, plant and equipment recognised as of acquisition date Document Registration Statement Document Registration Statement Disclosure of contingent liabilities [text block] Disclosure of contingent liabilities [text block] Segment and Geographical Information Disclosure of entity's operating segments [text block] Depreciation Depreciation of right-of-use assets Depreciation, right-of-use assets Delivery of shares upon settlement of RSUs (in shares) Delivery Of Shares Upon Settlement Of RSUs, Shares Delivery Of Shares Upon Settlement Of RSUs, Shares Temporary difference, unused tax losses and unused tax credits [domain] Temporary difference, unused tax losses and unused tax credits [domain] Issuance of subordinate voting shares pursuant to vesting of share-based compensation granted on business acquisitions (in shares) Increase (Decrease) Through Share-Based Payment Transactions Vested Issued On Business Combination, Shares Increase (Decrease) Through Share-Based Payment Transactions Vested Issued On Business Combination, Shares Shares purchased for cancellation (in shares) Shares purchased for cancellation (in shares) Stock Purchased For Cancellation, Shares Stock Purchased For Cancellation, Shares Accumulated amortization Accumulated depreciation and amortisation [member] Deficit Retained earnings [member] Period, Interest BA/CDOR Rate Period, Interest BA/CDOR Rate Period, Interest BA/CDOR Rate Other debt Other Debt From Business Combination [Member] Other Debt From Business Combination Summary of Income Tax Expense (Recovery) Disclosure Of Income Tax Expense Income Explanatory [Table Text Block] Disclosure of income tax expense income. Earn-out consideration, weighted average share price, training days Earn-Out Consideration, Weighted Average Share Price, Training Days Earn-Out Consideration, Weighted Average Share Price, Training Days Net Financial Expenses Disclosure of finance income (cost) [text block] Issuance of subordinate voting shares from settlement of DSUs and RSUs Issuance of subordinate voting shares Increase (decrease) through conversion of convertible instruments, equity 1-2 years 2028 Later than one year and not later than two years [member] ERP-US Enterprise Resource Planning US [Member] Enterprise resource planning US Leases Description of accounting policy for leases [text block] Tax credits Tax Credits Tax credits. Employee compensation and subcontractor costs Employee Compensation Costs And Subcontractor Costs Employee Compensation Costs And Subcontractor Costs Deductible temporary differences for which no deferred tax asset is recognized Deductible temporary differences for which no deferred tax asset is recognised Disclosure of reconciliation of liabilities arising from financing activities [abstract] Depreciation and amortization Depreciation and amortisation expense Business Contact Business Contact [Member] Supplementary Cash Flow Information Disclosure Of Supplemental Cash Flow Information Explanatory [Text Block] Disclosure of supplemental cash flow information explanatory. Carrying amount Carrying amount [member] Earn-out consideration, settlement period Earn-Out Consideration, Settlement Period Achieving Growth Above Gross Margin, Term After Acquisition Not allocated Not Allocated, Netting [Member] Not Allocated, Netting Remaining Performance Obligations [Abstract] Remaining Performance Obligations [Abstract] Shares purchased for settlement of RSUs Shares purchased for settlement of RSUs Shares Purchased for Settlement Of RSUs, Value Shares Purchased for Settlement Of RSUs, Value Expired (in CAD/USD per option) Weighted average exercise price of share options expired in share-based payment arrangement Consideration, Business Combination [Domain] Consideration, Business Combination [Domain] Consideration, Business Combination [Domain] Repayment of other long-term debt Repayments Of Other Noncurrent Borrowings Repayments Of Other Noncurrent Borrowings Changes in equity [abstract] Changes in equity [abstract] Deferred financing costs Deferred Financing Costs [Member] Deferred financing costs. Advances on the Credit Facility, net of related transaction costs Proceeds from non-current borrowings Forfeited (in shares) Number of share options forfeited in share-based payment arrangement Number of share options forfeited in share-based payment arrangement Disclosure of terms and conditions of share-based payment arrangement [abstract] Disclosure of terms and conditions of share-based payment arrangement [abstract] Shares purchased for cancellation Cancellation of treasury shares ImpairmentLossRecognised on Datum Transaction ImpairmentLossRecognised on Datum Transaction ImpairmentLossRecognised on Datum Transaction ImpairmentLossRecognised on Datum Transaction Right-of-use assets Beginning balance Ending balance Right-of-use assets Right-of-use assets Contact Personnel Name Contact Personnel Name Holdback used in accounts payable and accrued liabilities Holdback Used In Accounts Payable And Accrued Liabilities Holdback Used In Accounts Payable And Accrued Liabilities Tranche [Domain] Tranche [Domain] Tranche [Domain] Net assets disposed Assets (liabilities) Amortization of finance costs Increase (Decrease) Through Amortization Of Financing Fees Liabilities Arising From Financing Activities Increase decrease through amortization of financing fees liabilities arising from financing activities. Additions Additions Other Than Through Business Combinations, Lease Liabilities Additions Other Than Through Business Combinations, Lease Liabilities Summary of External Revenues and Long-lived Assets by Geographic Location Disclosure of geographical areas [text block] Items that may be classified subsequently to profit or loss Components of other comprehensive income that will be reclassified to profit or loss, net of tax [abstract] Share-based compensation Share-Based Compensation Expense Since Acquisition Date Share-Based Compensation Expense Since Acquisition Date Range [Domain] Statistical Measurement [Domain] Share purchase plan – employer contribution Share-Based Payment Arrangements, Employer Contribution [Member] Share-Based Payment Arrangements, Employer Contribution Major business combination Major business combination [member] Commitments And Contingencies [Abstract] Commitments And Contingencies Liabilities arising from financing activities [axis] Liabilities arising from financing activities [axis] 3.31 to 3.95 Three Point Three One To Three Point Nine Five [Member] Three Point Three One To Three Point Nine Five Deferred Tax Assets Deferred Tax Assets [Member] Deferred tax assets. Operating expenses Operating commitments Operating expense Estimated useful lives of intangible assets Useful life measured as period of time, intangible assets other than goodwill Classes of share capital [axis] Classes of share capital [axis] Number of share options exercised in share-based payment arrangement (in shares) Exercised (in shares) Number of share options exercised in share-based payment arrangement Principles of Consolidation Disclosure of basis of consolidation [text block] Non-deductible share-based compensation expense Tax effect of expense not deductible in determining taxable profit (tax loss) DSUs Deferred Share Units [Member] Deferred Share Units Current portion of long-term debt Current portion of non-current borrowings Leases [Abstract] Lease [Abstract] Lease Shareholders' equity Equity at beginning of period Equity at end of period Equity Entity Addresses, Address Type [Axis] Entity Addresses, Address Type [Axis] Property and equipment Opening cost Ending cost Property, plant and equipment Gross margin Gross profit Alithya Canada Inc. Alithya Canada Inc [Member] Alithya Canada Inc. Other receivables Other receivables Contingent consideration, payable, percentage Contingent Consideration, Payable, Percentage Contingent Consideration, Payable, Percentage Strategic consulting and enterprise transformation services - time and materials arrangements Strategic Consulting And Enterprise Transformation Services - Time And Materials Arrangements [Member] Strategic Consulting And Enterprise Transformation Services - Time And Materials Arrangements Types of contracts [domain] Types of contracts [domain] Corporate information and statement of IFRS compliance [abstract] Purchased call options [member] Purchased call options [member] Contingent consideration Contingent consideration [member] Operating expenses Operating Cost [Abstract] Operating cost. Disclosure of detailed information about property, plant and equipment [line items] Disclosure of detailed information about property, plant and equipment [line items] Subordinate Voting Shares Subordinate Voting Shares [Member] Subordinate voting shares. Unused capacity on facility Undrawn borrowing facilities eVerge Intersts, Inc. eVerge Interests, Inc. [Member] eVerge Interests, Inc. Disclosure of non-adjusting events after reporting period [abstract] Disclosure of non-adjusting events after reporting period [abstract] Furniture, fixtures and equipment Fixtures and fittings [member] Beginning balance (in CAD/USD per option) Ending balance (in CAD/USD per option) Weighted average exercise price of share options outstanding in share-based payment arrangement Enterprise Ressource Planning - US [Member] Enterprise Ressource Planning - US [Member] Enterprise Ressource Planning - US Total non-cash Increase (Decrease) Through Non Cash Changes Liabilities Arising From Financing Activities Increase decrease through non cash changes liabilities arising from financing activities. Purchase Price Allocation, Adjustments [Axis] Purchase Price Allocation, Adjustments [Axis] Purchase Price Allocation, Adjustments Disclosure Of Contractual Maturities Of Financial Liabilities [Line Items] Disclosure Of Contractual Maturities Of Financial Liabilities [Line Items] Disclosure of contractual maturities of financial liabilities line items. Pre-tax WACC Percentage Of After Tax WACC Percentage of after tax WACC. Prepaids Adjustments For Decrease (Increase) In Prepaids Adjustments for decrease increase in prepaids. 31-60 days Later than one month and not later than two months [member] Realized foreign exchange (gain) loss on repayment of long-term debt Foreign Exchange Loss (Gain) On Repayment Of Long-Term Debt Foreign Exchange Loss (Gain) On Repayment Of Long-Term Debt Total Opening balance Total Deferred tax liability (asset) Disposals through divestiture PPE Disposals through divestiture PPE Disposals through divestiture PPE Change in Fair Value of Contingent Consideration Since Acquisition Date Change in Fair Value of Contingent Consideration Since Acquisition Date Change in Fair Value of Contingent Consideration Since Acquisition Date Changes in non-cash working capital items Net change in non-cash working capital items Other adjustments for non-cash items Total current liabilities Current liabilities 2.97 to 3.30 Two Point Nine Seven To Three Point Three Zero [Member] Two Point Nine Seven To Three Point Three Zero Trade and other receivables [abstract] Percent Reconciliation of average effective tax rate and applicable tax rate [abstract] Continuing and discontinued operations [axis] Continuing and discontinued operations [axis] Deferred tax assets Deferred tax assets Individual assets or cash-generating units [axis] Individual assets or cash-generating units [axis] Class B Shares Class B Shares [Member] Class B shares. Letters of credit Letters Of Credit [Member] Letters of credit. Support services Support Services [Member] Support Services ERP-CAN Industry Solutions [Member] Industry Solutions Rates Depreciation rate, property, plant and equipment Disclosure of temporary difference, unused tax losses and unused tax credits [line items] Disclosure of temporary difference, unused tax losses and unused tax credits [line items] Weighted average remaining exercise period – in years Weighted average remaining contractual life of outstanding share options State State [Member] State Unbilled revenues Unbilled Receivables Current1 Share-Based Compensation Plans Description of accounting policy for share-based payment transactions [text block] Alithya Financial Solutions, Inc. Alithya Financial Solutions Inc [Member] Alithya Financial Solutions, Inc. Statement of changes in equity [abstract] Issued (in shares) Number of instruments issued (in shares) Increase (Decrease) Through Conversion of Convertible Instruments, Shares Increase (Decrease) Through Conversion of Convertible Instruments, Shares Deficit Retained earnings Reorganization costs Reorganization Costs Related to Modifications to Cost Structure Reorganization Costs Related to Modifications to Cost Structure Losses available for carryforward and other tax deductions Losses Available For Carryforward And Other Tax Deductions [Member] Losses available for carryforward and other tax deductions. Summary of Preliminary Allocation of Fair Value of Assets Acquired and Liabilities Assumed Disclosure of detailed information about business combination [text block] Stock purchased for settlement of RSUs (in shares) Shares Repurchased for Settlement, Shares Shares Repurchased for Settlement, Shares Disclosure of detailed information about financial instruments [line items] Disclosure of detailed information about financial instruments [line items] Stock purchased for settlement of RSUs (in shares) Shares Purchased for Settlement Of RSUs, Shares Shares Purchased for Settlement Of RSUs, Shares Number of other equity instruments granted (in shares) Granted (in shares) Number of other equity instruments granted in share-based payment arrangement Types of risks [domain] Types of risks [domain] Issuance of stock, business combination Issuance of Stock, Business Combination Issuance of Stock, Business Combination Customer Concentration Risk Customer Concentration Risk [Member] Customer Concentration Risk Subsidiaries [axis] Subsidiaries [axis] Geographical [Domain] Geographical [Domain] Segmented Reporting Description of accounting policy for segment reporting [text block] Geographical areas [axis] Geographical areas [axis] Beginning balance Ending balance (a) Liabilities arising from financing activities Liabilities arising from financing activities 2037 & 2038 Two Thousand Thirty Seven And Eight [Member] Two Thousand Thirty Seven And Eight Lease liabilities Non-current portion Non-current lease liabilities Non-compete agreements Non Compete Agreements1 [Member] Non compete agreements. Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Technology licenses, infrastructure and other Technology Licenses Infrastructure And Other [Member] Technology licenses, infrastructure and other member. eVerge Interest Inc. eVerge Interest Inc. [Member] eVerge Interest Inc. Intangibles Opening cost Ending cost Intangible assets other than goodwill Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] Stock Purchased For Cancellation, Shares from Datum Transaction Stock Purchased For Cancellation, Shares from Datum Transaction Stock Purchased For Cancellation, Shares from Datum Transaction Accumulated other comprehensive income Accumulated other comprehensive income [member] Segments [domain] Segments [domain] Cash Cash, beginning of year Cash, end of year Cash and cash equivalents Business enablement services Business Enablement Services - Other [Member] Software revenue. Classes of ordinary shares [axis] Classes of ordinary shares [axis] 2043 Two Thousand And Forty Three [Member] Two Thousand And Forty Three Disclosure of non-adjusting events after reporting period [line items] Disclosure of non-adjusting events after reporting period [line items] Disclosure of Key Assumptions Used in Impairment Testing by CGU Disclosure of Key Assumptions And Sensitivity Analysis Used In Change In Assumptions Of Cash Generating Units Explanatory [Table Text Block] Key assumptions and sensitivity analysis used in change in assumptions of cash generating units explanatory. Auditor Information [Abstract] Auditor Information Summary of Compensation Paid or Payable to Directors and to Key Management for Services Disclosure of transactions between related parties [text block] Schedule of Long Term Debt Disclosure of detailed information about borrowings [text block] Equity and liabilities Equity and liabilities U.S. UNITED STATES Business combinations [axis] Business combinations [axis] Expenses by Nature Expenses, by nature Business combinations [domain] Business combinations [domain] Additions from business acquisition (note 4) Acquisitions through business combinations, right-of-use assets Disclosure of analysis of single amount of discontinued operations [line items] Disclosure of analysis of single amount of discontinued operations [line items] Intercompany receivable net of Credit Facility Intercompany Receivable [Member] Intercompany Receivable ifrs-full_TaxEffectOfTaxLossOnSaleOfSubsidiaries ifrs-full_TaxEffectOfTaxLossOnSaleOfSubsidiaries ifrs-full_TaxEffectOfTaxLossOnSaleOfSubsidiaries Transaction price allocated to remaining performance obligations Transaction price allocated to remaining performance obligations Tax credits receivable Noncurrent Tax Credits Receivable Recognised As Of Acquisition Date Noncurrent Tax Credits Receivable Recognised As Of Acquisition Date Accrued compensation Accrued Compensation, Current Accrued compensation current Depreciation Depreciation expense Contractual Lease Payments Under Lease Liabilities Disclosure of maturity analysis for non-derivative financial liabilities [text block] Expired (in shares) Number of share options expired in share-based payment arrangement Impacts of foreign exchange Increase (decrease) through effect of changes in foreign exchange rates, liabilities arising from financing activities Changes in liabilities arising from financing activities [abstract] Changes in liabilities arising from financing activities [abstract] Interest Rate Risk Interest rate risk [member] City Area Code City Area Code eVerge Software and Technology Services Pvt Ltd. eVerge Software and Technology Services Pvt Ltd. [Member] eVerge Software and Technology Services Pvt Ltd. Other debt from XRM Acquisition (note 11) Other Debt [Member] Other Debt USD USD United States of America, Dollars Operating income before depreciation and amortization and impairment of goodwill Operating Income Before Depreciation And Amortization Operating Income Before Depreciation And Amortization Prepaids Prepaids Recognised As Of Acquisition Date Prepaids Recognised As Of Acquisition Date Purchase consideration Purchase Consideration [Member] Purchase Consideration More than five years More than 5 years Later than five years [member] Alithya USA Consulting Services, LLC (formerly Alithya Fullscope Solutions, Inc.) Alithya Fullscope Solutions Inc [Member] Alithya Fullscope Solutions, Inc. Related Parties Disclosure of related party [text block] Classes of financial assets [domain] Classes of financial assets [domain] Impairment loss recognised in profit or loss, intangible assets and goodwill Impairment loss recognised in profit or loss, intangible assets and goodwill Maximum borrowing capacity, potential increase Borrowing Facilities, Maximum Borrowing Capacity, Potential Increase Borrowing Facilities, Maximum Borrowing Capacity, Potential Increase Intangibles Disclosure of intangible assets [text block] Time-and-materials contracts Time-and-materials contracts [member] Statement of compliance Statement of IFRS compliance [text block] Unamortized transaction costs Unamortized Transaction Costs, Netting [Member] Unamortized Transaction Costs, Netting Additions through business acquisition (note 4) Acquisitions through business combinations, intangible assets other than goodwill Lease interest Interest on lease liabilities Interest expense on lease liabilities Significant Management Judgement in Applying Accounting Policies and Estimation Uncertainty Disclosure of accounting judgements and estimates [text block] Repayment of the Credit Facility Repayments of non-current borrowings Goodwill (note 9) Goodwill recognised as of acquisition date Disclosure of classes of share capital [table] Disclosure of classes of share capital [table] Auditor Name Auditor Name Segment consolidation items [domain] Segment consolidation items [domain] Lease receivables Lease Receivables Lease Receivables Discount rate, contingent consideration Discount Rate, Contingent Consideration Discount Rate, Contingent Consideration Cash Cash1 [Member] Cash 1. Accounts Receivable and Other Receivables Disclosure of trade and other receivables [text block] Borrowings, optional renewal period term Borrowings, Optional Renewal Period Term Borrowings, Optional Renewal Period Term Total distributions to, and contributions by shareholders Increase (decrease) through transactions with owners, equity Past due status [axis] Past due status [axis] Remaining Performance Obligations Disclosure of transaction price allocated to remaining performance obligations [text block] Series B Preferred Shares Series B Preferred Shares [Member] Series B Preferred Shares Disclosure of major customers [line items] Disclosure of major customers [line items] Net cash from operating activities Cash flows from (used in) operating activities Forfeited (in shares) Number of other equity instruments forfeited in share-based payment arrangement Disclosure of terms and conditions of share-based payment arrangement [line items] Disclosure of terms and conditions of share-based payment arrangement [line items] Alithya France SAS Alithya France SAS [Member] Alithya Consulting SAS. Business Acquisition, Integration and Reorganization Costs Business Acquisition, Integration and Reorganization Costs [Table Text Block] Business Acquisition, Integration and Reorganization Costs Non-current liabilities Non-current liabilities [abstract] Entity Name of subsidiary Disclosure of non-current assets held for sale and discontinued operations Disclosure of non-current assets held for sale and discontinued operations [text block] Share-Based Payments Disclosure of share-based payment arrangements [text block] weighted average exercise period of share options exercisable in share-based payment arrangement weighted average exercise period of share options exercisable in share-based payment arrangement weighted average exercise period of share options exercisable in share-based payment arrangement Disclosure of detailed information about intangible assets [abstract] 3.96 to 4.55 Three Point Nine Six To Four Point Five Five [Member] Three Point Nine Six To Four Point Five Five Document Fiscal Year Focus Document Fiscal Year Focus Audited Annual Financial Statements Audited Annual Financial Statements Adjustments for: Adjustments to reconcile profit (loss) [abstract] Summary of Financial Expenses Schedule Of Net Finance Cost Explanatory [Table Text Block] Schedule of finance cost explanatory. Disclosure of finance lease and operating lease by lessee [line items] Disclosure of maturity analysis for non-derivative financial liabilities [line items] Unbilled revenues Adjustments For Decrease (Increase) In Unbilled Revenue Adjustments for decrease increase in unbilled revenue. Class A Shares Class A Shares [Member] Class A shares. Canadian Dollars/USD Exchange Rate Canadian Dollars USD Exchange Rate [Member] Canadian dollars/USD exchange rate. Deferred revenue Deferred Revenue Recognised As Of Acquisition Date Deferred revenue recognised as of acquisition date. Daily rate, calculation of non cumulative preferred dividend Daily Rate, Non-Cumulative Preferred Dividend, Daily Rate Daily Rate, Non-Cumulative Preferred Dividend, Daily Rate Employee’s basic contribution Basic Contribution Percentage Per Employee Basic contribution percentage per employee. Allowable purchase for cancellation of subordinate voting shares, percent Allowable Purchase for Cancellation of Subordinate Voting Shares, Percentage of Public Float Allowable Purchase for Cancellation of Subordinate Voting Shares, Percentage of Public Float Types of interest rates [domain] Types of interest rates [domain] Two Thousand And Forty Six Two Thousand And Forty Six [Member] Two Thousand And Forty Six ifrs-full_IncreaseDecreaseThroughConversionOfConvertibleInstruments ifrs-full_IncreaseDecreaseThroughConversionOfConvertibleInstruments ifrs-full_IncreaseDecreaseThroughConversionOfConvertibleInstruments Tranche [Axis] Tranche [Axis] Tranche Leasehold improvements Leasehold improvements [member] Accounting Standard Amendments And Interpretations Effective For The Year Ended March 31, 2025 And Future Accounting Standards Changes Disclosure of expected impact of initial application of new standards or interpretations [text block] Alithya Numérique Maroc SARLAU Alithya Numérique Maroc SARLAU [Member] Alithya Numérique Maroc SARLAU Contributed surplus Contributed Surplus [Member] Contributed surplus. Purchase price payable, maturity July 1, 2025 Purchase Price Payable, Maturity July 1, 2025 [Member] Purchase Price Payable, Maturity July 1, 2025 Current portion of lease liabilities Current Portion of Lease Liabilities Recognized as of Acquisition Date Current Portion of Lease Liabilities Recognized as of Acquisition Date Share based payment arrangement, maximum eligible employee annual bonus DSU Share based Payment Arrangement, Maximum Eligible Employee Annual Bonus DSU Share based Payment Arrangement, Maximum Eligible Employee Annual Bonus DSU Current tax expense: Current tax expense (income) and adjustments for current tax of prior periods [abstract] Trade payables Current trade payables Business acquisitions, net of cash acquired Cash Flows From (Used In) Change Of Control Of Subsidiaries Or Other Businesses Cash Flows From (Used In) Change Of Control Of Subsidiaries Or Other Businesses Key management personnel compensation Key management personnel compensation Disclosure of credit risk exposure [line items] Disclosure of credit risk exposure [line items] Other assets Adjustments for decrease (increase) in other assets Disclosure of maturity analysis for non-derivative financial liabilities [table] Disclosure of maturity analysis for non-derivative financial liabilities [table] Additions, internally generated Additions Internally Generated Other Than Through Business Combinations Intangible Assets Other Than Goodwill Additions internally generated other than through business combinations intangible assets other than goodwill. Earnings (Loss) Per Share Disclosure of earnings per share [text block] Cost Gross carrying amount [member] Datum Consulting Group, LLC (b) Datum Consulting Group, LLC [Member] Datum Consulting Group, LLC Company's statutory tax rate Applicable tax rate Income tax (recovery) expense Current and deferred tax relating to items charged or credited directly to equity [abstract] Contingent Consideration [Domain] Contingent Consideration [Domain] Contingent Consideration [Domain] Net financial expenses Adjustments for finance costs Local Phone Number Local Phone Number Proceeds from issuing shares Proceeds from issuing shares 2040 Two Thousand And Forty [Member] Two Thousand And Forty Summary of Acquisition Date Fair Value of Each Major Class of Consideration Transferred Disclosure Of Acquisition Date Fair Value Of Each Major Class Of Consideration Transferred Explanatory [Table Text Block] Disclosure of acquisition date fair value of each major class of consideration transferred. Less than 1 year 2027 Not later than one year [member] Non-employee directors Non Employee Directors [Member] Non Employee Directors Disclosure of detailed information about property, plant and equipment [abstract] Lease termination costs Lease Termination Costs Lease Termination Costs Number of operating segments Number Of Operating Segments Number Of Operating Segments Increase (Decrease) Through Remeasurement, Right of use Increase (Decrease) Through Remeasurement, Right of use Increase (Decrease) Through Remeasurement, Right of use Intangibles (note 8) Identifiable intangible assets recognised as of acquisition date Long-term debt Non-current portion of non-current borrowings Cash consideration Cash transferred Purchase price payable Liabilities incurred Property and Equipment ("P&E") Description of accounting policy for property, plant and equipment [text block] Total purchase consideration Consideration transferred, acquisition-date fair value Consideration transferred, acquisition-date fair value Repayment of lease liabilities, including lease termination costs Payments of lease liabilities, classified as financing activities Business Acquisition Disclosure of business combinations [text block] Profit or loss weakening Sensitivity Analysis, Impact On Profit (Loss), Decrease Sensitivity Analysis, Impact On Profit (Loss), Decrease Contingent consideration adjustment (note 20) Increase (decrease) through changes in fair values, liabilities arising from financing activities Percentage ownership (in percentage) Proportion of ownership interest in subsidiary Entity Registrant Name Entity Registrant Name Basic earnings (loss) per share (in CAD per share) Basic earnings (loss) per share Unrealized foreign exchange loss (gain) Adjustments for unrealised foreign exchange losses (gains) Liquidity risk Liquidity risk [member] Weighted average number of shares outstanding, diluted (in shares) Weighted average number of ordinary shares used in calculating diluted earnings per share Settlement of RSUs and PSUs, including withholding taxes paid Income taxes paid (refund), classified as financing activities Origination and reversal of temporary differences Deferred tax expense (income) relating to origination and reversal of temporary differences Classes of intangible assets other than goodwill [domain] Classes of intangible assets other than goodwill [domain] Disclosure of associates [table] Disclosure of associates [table] Business acquisition, integration and reorganization costs Description of accounting policy for customer acquisition costs [text block] Share-based compensation Adjustments for share-based payments Estimated financial effect of contingent liabilities Estimated financial effect of contingent liabilities Purchase Consideration [Domain] Purchase Consideration [Domain] Purchase Consideration [Domain] Major components of tax expense (income) [abstract] Major components of tax expense (income) [abstract] Changes in Lease Liability [Abstract] Changes in Lease Liability [Abstract] Changes in Lease Liability Shares Repurchased for Cancellation, Value for Datum Transaction Shares Repurchased for Cancellation, Value for Datum Transaction Shares Repurchased for Cancellation, Value for Datum Transaction Contingent consideration, cash Contingent Consideration Recognised As Of Acquisition Date, Cash Contingent Consideration Recognised As Of Acquisition Date, Cash Segment consolidation items [axis] Segment consolidation items [axis] 2039 Two Thousand And Thirty Nine [Member] Two Thousand And Thirty Nine Remeasurement Increase (Decrease) Through Remeasurement, Lease Liabilities Increase (Decrease) Through Remeasurement, Lease Liabilities Total assets acquired Assets Acquired Recognised As Of Acquisition Date Assets acquired recognised as of acquisition date. Exercisable at year end (in CAD/USD per option) Weighted average exercise price of share options exercisable in share-based payment arrangement All Currencies All Currencies [Domain] Shareholders' equity Equity [abstract] Entity Addresses [Line Items] Entity Addresses [Line Items] Other expenses Other expenses, by nature Disclosure of detailed information about financial instruments [abstract] Disclosure of operating segments [abstract] Disclosure of operating segments [abstract] Disclosure of Key Assumptions in the Values of the Recoverable Amount Calculation Disclosure of Key Assumptions in the Values of the Recoverable Amount Calculation [Table Text Block] Disclosure of Key Assumptions in the Values of the Recoverable Amount Calculation Change in unrecognized deferred tax assets Change In Unrecognized Deferred Tax Asset Change in unrecognized deferred tax asset. Exercise of stock options Proceeds from exercise of options Disclosure of transactions between related parties [abstract] Ranges of exercise prices for outstanding share options [domain] Ranges of exercise prices for outstanding share options [domain] Maximum eligible per employee, annual bonus in DSUs and or RSUs Maximum Eligible Per Employee, Annual Bonus in DSUs And Or RSUs Maximum Eligible Per Employee, Annual Bonus in DSUs And Or RSUs Additions, purchased Additions other than through business combinations, intangible assets other than goodwill Purchase Price Payable, Maturity May 31, 2027 Purchase Price Payable, Maturity May 31, 2027 [Member] Purchase Price Payable, Maturity May 31, 2027 ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Total contributions by, and distributions to, shareholders (in shares) Increase (Decrease) Through Transactions With Owners, Shares Changes in equity shares. Over 90 days Later than three months [member] Disclosure of temporary difference, unused tax losses and unused tax credits [table] Disclosure of temporary difference, unused tax losses and unused tax credits [table] Total cash outflow for leases Cash outflow for leases Impairment loss Impairment loss Auditor Firm ID Auditor Firm ID Amortization of finance costs Amortization Of Finance Costs Amortization Of Finance Costs Short-term employee benefits Key management personnel compensation, post-employment benefits Consumption taxes payable Consumption Taxes Payable, Current Consumption taxes payable. Types of contracts [axis] Types of contracts [axis] Additional Information on consolidated earnings (loss) Disclosure of additional information [text block] Current portion of contingent consideration CurrentPortionOf Contingent consideration CurrentPortionOf Contingent consideration Alithya USA, Inc. Alithya USA Inc [Member] Alithya USA, Inc. Schedule of Operating Commitments Disclosure of Operating Commitments [Table Text Block] Disclosure of Operating Commitments Profit (loss) from business acquired Profit (loss) of acquiree since acquisition date Total liabilities Liabilities Other Other tax rate effects for reconciliation between accounting profit and tax expense (income) Government Assistance Description of accounting policy for government grants [text block] Other liabilities (included in long-term debt) Other Long Term Debt [Member] Other Long Term Debt Vesting date, deferred stock units Vesting Date, Deferred Stock Units Vesting Date, Deferred Stock Units Income taxes payable Income Taxes Payable As Of Acquisition Date Income Taxes Payable As Of Acquisition Date Change in exchange rate to foreign currencies Change In Exchange Rate To Foreign Currencies Change in exchange rate to foreign currencies. Computer equipment Office equipment [member] Right-of-use assets Right-of-Use Asset Recognized as of Acquisition Date Right-of-Use Asset Recognized as of Acquisition Date Disclosure of subsidiaries [table] Disclosure of subsidiaries [table] Contingent consideration Contingent consideration recognised as of acquisition date Summary of Carrying Amount and Contractual Maturities of Financial Liabilities Disclosure of maturity analysis for derivative financial liabilities [text block] Disclosure of contingent liabilities in business combination [table] Disclosure of contingent liabilities in business combination [table] Share-based compensation granted on business acquisitions Share-Based Payment Arrangements, Business Acquisitions [Member] Share-Based Payment Arrangements, Business Acquisitions Number of reportable segments Number Of Reportable Segments Number Of Reportable Segments Accounts payable and accrued liabilities Trade and other payables recognised as of acquisition date Intangibles Description of accounting policy for intangible assets other than goodwill [text block] Foreign currency translation adjustment Increase (decrease) through net exchange differences, property, plant and equipment Disclosure of nature and extent of risks arising from financial instruments [table] Disclosure of nature and extent of risks arising from financial instruments [table] Lease liabilities Lease liabilities [member] Forfeited (in CAD/USD per option) Weighted average exercise price of share options forfeited in share-based payment arrangement Business acquisition, integration and reorganization costs Business Acquisition, Integration and Reorganization Costs Business Acquisition, Integration and Reorganization Costs Financial liabilities, at fair value Financial liabilities, at fair value Repayment of balances of purchase price payable Repayment of balances of purchase price payable Repayment of balances of purchase price payable Non-adjusting events after reporting period [axis] Non-adjusting events after reporting period [axis] Consideration, Business Combination [Axis] Consideration, Business Combination [Axis] Consideration, Business Combination Continuing operations, unless line item indicates otherwise [member] Continuing operations, unless line item indicates otherwise [member] Disposals through divestiture Disposals through divestiture Disposals through divestiture Subordinate Voting Shares and Multiple Voting Shares Subordinate Voting Shares And Multiple Voting Shares [Member] Subordinate voting shares and multiple voting shares. Top of range Top of range [member] Earnings per share [line items] Earnings per share [line items] Intangible assets and goodwill [abstract] Scenario [Axis] Scenario [Axis] Other assets Other non-current assets 2030 Later than three years and not later than four years [member] Tax credits receivable Current Tax Credits Receivable Recognised As Of Acquisition Date Current Tax Credits Receivable Recognised As Of Acquisition Date Disclosure Of Contractual Maturities Of Financial Liabilities [Table] Disclosure Of Contractual Maturities Of Financial Liabilities [Table] Disclosure of contractual maturities of financial liabilities. Proceeds Increase (Decrease) Through Proceeds Liabilities Arising From Financing Activities Increase decrease through proceeds liabilities arising from financing activities. Tax credits and other Other Deferred Tax Liabilities [Member] Other deferred tax liabilities. Equity interest issued or issuable Business Acquisition, Equity Interest Issued or Issuable1 Business Acquisition, Equity Interest Issued or Issuable1 Summary of Quantitative Data About Exposure to Currency Risk Summary quantitative data about entity's exposure to risk [text block] Long lived assets Non-current assets other than financial instruments, deferred tax assets, post-employment benefit assets, and rights arising under insurance contracts Subordinated unsecured loans Subordinated Unsecured Loan [Member] Subordinated Unsecured Loan Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Borrowings by name [domain] Borrowings by name [domain] Currency risk Currency risk [member] 61-90 days Later than two months and not later than three months [member] Trade receivables Trade receivables [member] Number of stock options available to purchase of shares (in shares) Number Of Stock Options Available To Purchase Of Shares Number of stock options available to purchase of shares. Percentage of aggregate number of shares issued and outstanding Percentage Of Aggregate Number Of Shares Issued And Outstanding Percentage of aggregate number of shares issued and outstanding. Deferred tax liabilities Deferred tax liabilities Deferred tax liabilities Geographical [Axis] Geographical [Axis] XRM Vision Maroc SARLAU XRM Vision Maroc SARLAU [Member] XRM Vision Maroc SARLAU Other comprehensive (loss) income Other comprehensive loss Other comprehensive income Change In Fair Value Of Contingent Consideration Recognized InProfitOrLoss Change In Fair Value Of Contingent Consideration Recognized In Profit Or Loss Change In Fair Value Of Contingent Consideration Recognized In Profit Or Loss Alithya Enterprise Solutions, LLC (formerly Alithya Ranzal LLC) Alithya Ranzal LLC [Member] Alithya Ranzal LLC. DCG Team UK Limited (b) DCG Team UK Limited [Member] DCG Team UK Limited Past due status [domain] Past due status [domain] Identifiable assets acquired (liabilities assumed) Identifiable assets acquired (liabilities assumed) Types of share-based payment arrangements [axis] Types of share-based payment arrangements [axis] Depreciation and amortization Adjustments for depreciation and amortisation expense Forecast Forecast [Member] Weighted average duration of revenue recognised from transaction price allocated to remaining performance obligations Weighted Average Duration Of Revenue Recognised from Transaction Price Allocated To Remaining Performance Obligations Weighted Average Duration Of Revenue Recognised from Transaction Price Allocated To Remaining Performance Obligations Interest on long-term debt Interest expense on borrowings Disclosure of subsidiaries [line items] Disclosure of subsidiaries [line items] Issuance of subordinate voting shares from exercise of stock options Issue of equity Assets and liabilities [axis] Assets and liabilities [axis] Long lived assets, percentage Percentage Of Noncurrent Assets Percentage of noncurrent assets. Disclosure Of Significant Accounting Policies [Abstract] Disclosure Of Significant Accounting Policies [Abstract] Disclosure of significant accounting policies. No customer No customer [Member] No customer Cash transferred, percentage Cash Transferred, Percentage Cash Transferred, Percentage Integration costs Integration Costs Integration Costs Additions Other Than Through Business Combinations, Right-of-Use Assets Additions Other Than Through Business Combinations, Right-of-Use Assets Additions Other Than Through Business Combinations, Right-of-Use Assets Repayments Increase (Decrease) Through Repayment Liabilities Arising From Financing Activities Increase decrease through repayment liabilities arising from financing activities. Contingent consideration, future financial performance, consecutive period Contingent Consideration, Future Financial Performance, Consecutive Period Contingent Consideration, Future Financial Performance, Consecutive Period Summary of Issued Share Capital Disclosure of issued capital [text block] Subsidiaries [domain] Subsidiaries [domain] Repayment of secured loans Repayments of borrowings, classified as financing activities Licenses and telecommunications License And Telecommunication Fees License And Telecommunication Fees Disclosure of Credit Risk Disclosure of credit risk exposure [text block] Borrowings by name [axis] Borrowings by name [axis] Shares purchased for settlement of RSUs Shares purchased for settlement Shares Repurchased for Settlement, Value Shares Repurchased for Settlement, Value Summary of Accounts Receivable and Other Receivables Disclosure Of Detailed Information About Accounts Receivable And Other Receivable Explanatory [Table Text Block] Disclosure of detailed information about accounts receivable and other receivable explanatory. Financial Instruments Disclosure of financial instruments [text block] Commitments and Contingencies Disclosure of commitments and contingent liabilities [text block] Summary of Depreciation Method of Property and Equipment Disclosure of detailed information about property, plant and equipment [text block] Borrowings, interest rate Borrowings, interest rate Net cash used in investing activities Cash flows from (used in) investing activities Increase (decrease) through other changes, equity Shares cancellation related to a sunset clause Shares cancellation related to a sunset clause Disclosure of range of exercise prices of outstanding share options [table] Disclosure of range of exercise prices of outstanding share options [table] Adjustments Increase (Decrease) at Closing [Member] Increase (Decrease) at Closing Unbilled revenues Unbilled Revenues Recognised As Of Acquisition Date Unbilled Revenues Recognised As Of Acquisition Date Disclosure of detailed information about intangible assets [line items] Disclosure of detailed information about intangible assets [line items] Lease liabilities Noncurrent Portion of Lease Liabilities Recognized as of Acquisition Date Noncurrent Portion of Lease Liabilities Recognized as of Acquisition Date Payments of incremental benefit in the event of termination Employee benefits expense Amortization of intangibles Amortization Amortisation, intangible assets other than goodwill Financial Instruments Description of accounting policy for financial instruments [text block] Total current assets Current assets Accounts receivable and other receivables Accounts Receivable And Other Receivables [Member] Accounts receivable and other receivables. Customer [Axis] Customer [Axis] Stock options Share options [member] PSUs Performance Share Units [Member] Performance Share Units Disclosure of operating segments [table] Disclosure of operating segments [table] Recognized in earnings Deferred tax expense (income) recognised in profit or loss Additions Additions other than through business combinations, right-of-use assets Revenue Benchmark Revenue Benchmark [Member] Revenue Benchmark Segments [axis] Segments [axis] Lease payments Decrease Through Payment, Lease Liabilities Decrease Through Payment, Lease Liabilities Types of risks [axis] Types of risks [axis] Canadian or US prime rate Canadian Or US Prime Rate [Member] Canadian or US prime rate. Trade and other payables [abstract] Reasonably increase in interest rates of borrowings Reasonably Increase In Interest Rates Of Borrowings Reasonably Increase In Interest Rates Of Borrowings Delivery of shares upon settlement of RSUs Delivery Of Shares Upon Settlement Of RSUs, Value Delivery Of Shares Upon Settlement Of RSUs, Value Supplementary Cash Flow Information [Abstract] Supplementary cash flow information. 2.76 to 3.44 Two Point Seven Six To Three Point Four Four Exercise Price [Member] Three point eight six to four point four five exercise price. Disclosure of transactions between related parties [table] Disclosure of transactions between related parties [table] Depreciation expense Depreciation of property and equipment Depreciation, property, plant and equipment Profit (loss) [abstract] Profit (loss) [abstract] Exercised (in CAD/USD per option) Weighted average exercise price of share options exercised in share-based payment arrangement Stock issued during period shares business combination (in shares) Stock Issued During Period, Business Combination, Shares Stock issued during period shares business combination. Disclosure of non-adjusting events after reporting period [table] Disclosure of non-adjusting events after reporting period [table] Property and Equipment Disclosure of property, plant and equipment [text block] Amendment Flag Amendment Flag Components of equity [domain] Components of equity [domain] Disclosure of operating segments [line items] Disclosure of operating segments [line items] Intangibles and goodwill Intangible Assets And Goodwill [Member] Intangible Assets And Goodwill Temporary difference, unused tax losses and unused tax credits [axis] Temporary difference, unused tax losses and unused tax credits [axis] ifrs-full_TaxRateEffectOfTaxLossOnSaleOfSubsidiaries ifrs-full_TaxRateEffectOfTaxLossOnSaleOfSubsidiaries ifrs-full_TaxRateEffectOfTaxLossOnSaleOfSubsidiaries Termination benefits Key management personnel compensation, termination benefits Range [domain] Range [domain] Long Term Incentive Plan Long Term Incentive Plan [Member] Long Term Incentive Plan. Scenario [Domain] Scenario [Domain] Impairment of goodwill Tax effect of impairment of goodwill Expense from share-based payment transactions Expense from share-based payment transactions Tax credits receivable Adjustments For Decrease (Increase) In Tax Credits Receivable Adjustments for decrease increase in tax credits receivable. Issuance of Subordinate Voting Shares pursuant to vesting of share-based compensation granted on business acquisitions Increase (Decrease) Through Share-Based Payment Transactions Vested Issued On Business Combination Increase decrease through share based payment transactions vested issued on business combination. Contingent consideration, achieving growth above gross margin, term Contingent Consideration, Growth Above Gross Margin, Term Contingent Consideration, Growth Above Gross Margin, Term Summary of Effective Income Tax Rate Differs from Federal and Provincial Statutory Tax Rate Disclosure Of Effective Income Tax Rate Differs With Federal Statutory Tax Rate Explanatory [Table Text Block] Disclosure of effective income tax rate differs with federal statutory tax rate. Address Type [Domain] Address Type [Domain] Borrowings, nominal value Notional amount Balances of purchase price payable Purchase Payable Non Interest Bearing [Member] Purchase payable, non-interest bearing. Current portion of lease liabilities Current portion Current lease liabilities Potential impact on results, increase (decrease) in earnings Contingent Consideration, Potential Impact On Results, Increase (Decrease) In Earnings Contingent Consideration, Potential Impact On Results, Increase (Decrease) In Earnings Incremental increase in after-tax WACC Percentage Of Incremental Increase Of After Tax WACC Percentage Of Incremental Increase Of After Tax WACC Summary of Accounts Payable and Accrued Liabilities Disclosure Of Detailed Information About Accounts Payable And Accrued Liabilities Explanatory [Table Text Block] Disclosure of detailed information about accounts payable and accrued liabilities explanatory. Concentrations of risk [axis] Concentrations of risk [axis] Currency Currency [Axis] Change in fair value of contingent consideration Increase (decrease) in contingent consideration asset (liability) Diluted earnings (loss) per share (in CAD per share) Diluted earnings (loss) per share Maturity [domain] Maturity [domain] Share Capital Description of accounting policy for issued capital [text block] Summary of Primary Subsidiaries Disclosure of subsidiaries [text block] Disclosure of terms and conditions of share-based payment arrangement [table] Disclosure of terms and conditions of share-based payment arrangement [table] Derecognition Disposals and retirements, right-of-use assets Issuance of shares upon settlement of PSUs (in shares) Issuance Of Shares Upon Settlement Of PSUs, Shares Issuance Of Shares Upon Settlement Of PSUs, Shares Effective income tax rate Average effective tax rate Disclosure of reconciliation of liabilities arising from financing activities [table] Disclosure of reconciliation of liabilities arising from financing activities [table] Loss on disposal of property and equipment, intangible and lease modification Adjustments for Impairment Loss of Property, Plant and Equipment Including Right-of-Use Assets And Loss on Remeasurement of Lease Liabilities Adjustments for Impairment Loss of Property, Plant and Equipment Including Right-of-Use Assets And Loss on Remeasurement of Lease Liabilities Earnings Per Share Earnings per share [text block] Disclosure of associates [line items] Disclosure of associates [line items] Disclosure of detailed information about property, plant and equipment [table] Disclosure of detailed information about property, plant and equipment [table] Additions to intangibles Purchase of intangible assets, classified as investing activities Financing fees Interest And Finance Charges Interest and finance charges. Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Accounts payable and accrued liabilities Adjustments For Decrease (Increase) In Accounts Payable And Accrued Liabilities Adjustments for decrease increase in accounts payable and accrued liabilities. Datum Cybertech India Pvt Ltd. (b) Datum Cybertech India Pvt Ltd. [Member] Datum Cybertech India Pvt Ltd. Capital Capitals Capital.