Operating (loss) income Income (loss) before income taxes Income (loss) before income taxes Net income (loss) Net income (loss) Total other comprehensive income (loss) Other comprehensive income (loss), net of tax (expense) recovery Total comprehensive income (loss) Total comprehensive income, net Consolidated Statements of Changes in Shareholders’ Equity [Abstract] SHAREHOLDERS’ EQUITY Balance Balance Total shareholders’ equity Components of equity [axis] Total current assets Total assets Total current liabilities Current liability Total liabilities Total Telesat Corporation shareholders’ equity Total liabilities and shareholders’ equity Net cash from operating activities Net cash (used in) generated from investing activities Net cash (used in) generated from financing activities Changes in cash and cash equivalents Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Cash and cash equivalents Cash and cash equivalents Cash and cash equivalent Background of the Company [Abstract] Basis of Presentation and Going Concern [Abstract] Material Accounting Policy Information [Abstract] Segment Information [Abstract] Products and services [axis] Segments [axis] Geographical areas [axis] Operating Expenses [Abstract] Schedule of Operating Expenses [Abstract] Operating expenses Operating expenses Operating expenses Interest Expense [Abstract] Schedule of Interest Expense [Abstract] Interest expense Interest expense Interest expense Other Operating Gains (Losses), Net [Abstract] Other operating gains (losses), net Other operating gains (losses), net Income Taxes [Abstract] Schedule of Income Tax Expense [Abstract] Tax expense (recovery) Tax (expense) recovery Tax (expense) recovery Schedule of Reconciliation of the Statutory Income Tax Rate [Abstract] Satellites, Property and Other Equipment [Abstract] Goodwill and Intangible Assets [Abstract] Lease Liabilities [Abstract] Maturity [axis] Indebtedness [Abstract] Debt Instruments [Axis] Borrowings by name [axis] Balance Balance Classes of financial liabilities [axis] Share Capital [Abstract] Classes of share capital [axis] Counterparty Name [Axis] Non-Controlling Interest [Abstract] Share-Based Compensation Plans [Abstract] Number of options Outstanding, Beginning Balance (in Shares) Number of options Outstanding, Ending Balance (in Shares) Number of shares Weighted average exercise price Outstanding, Beginning Balance Weighted average exercise price Outstanding, Ending Balance Ranges of exercise prices for outstanding share options [axis] Types of share-based payment arrangements [axis] RSUs with time criteria, beginning balance RSUs with time criteria, Ending balance PSUs with time and performance criteria, Beginning balance PSUs with time and performance criteria, Ending balance DSUs, Beginning balance DSUs, Ending balance Earnings Per Share [Abstract] Net income (loss) per common share attributable to Telesat Corporation shareholders Schedule of Basic and Diluted Per Share [Abstract] Diluted net income (loss) attributable to Telesat Common Shares Types of antidilutive instruments [axis] Diluted total weighted average number of Telesat Common Shares outstanding Diluted (in Shares) Government Grant [Abstract] Capital Disclosures [Abstract] Schedule of Capital [Abstract] Financial Instruments [Abstract] Total contractual maturities of financial assets Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Classes of financial instruments [axis] Levels of fair value hierarchy [axis] Categories of financial assets [axis] Classes of financial assets [axis] Beginning balance Ending balance Derivative liabilities Warrants [Axis] Employee Benefit Plans [Abstract] Defined benefit plans [axis] Supplemental Cash Flow Information [Abstract] Schedule of Cash and Cash Equivalents [Abstract] Schedule of Income Taxes Paid, Net of Income Taxes Received [Abstract] Income taxes paid, net of income tax received Schedule of Interest paid, Net of interest Received [Abstract] Interest paid, net of interest received Beginning balance Ending balance Long-term indebtedness Schedule of Net Change in Operating Assets and Liabilities [Abstract] Operating assets and liabilities Operating assets and liabilities Schedule of Non-Cash Investing Activities [Abstract] Commitments and Contingent Liabilities [Abstract] Property, plant and equipment by operating lease status [axis] Related Party Transactions [Abstract] Document Type Document Fiscal Year Focus Entity File Number Entity Registrant Name Entity Central Index Key Amendment Flag Document Period End Date Document Fiscal Period Focus Current Fiscal Year End Date Revenue Interest and other income Gain (loss) on changes in fair value of financial instruments Gain (loss) on foreign exchange (Gain) loss on foreign exchange Net income (loss) attributable to: Telesat Corporation shareholders Net income (loss) attributable to Telesat Common Shares Non-controlling interest Basic (in Dollars per share) Diluted (in Dollars per share) Total Weighted Average Common Shares Outstanding Basic (in Shares) Basic total weighted average number of Telesat Common Shares outstanding Other comprehensive income (loss) Items that may be reclassified into profit or loss Foreign currency translation adjustments Total comprehensive income (loss) attributable to: Telesat Corporation shareholders Non-controlling interest Issuance of share capital on settlement of restricted share units, performance share units, and the exercise of stock options Exchange of Limited Partnership units for Public Shares Other comprehensive income (loss), net of tax (expense) Share-based compensation Share-based compensation, net of tax (expense) ASSETS Trade and other receivables Other current financial assets Current income tax recoverable Prepaid expenses and other current assets Satellites, property and other equipment Deferred tax assets Other long-term financial assets Long-term income tax recoverable Other long-term assets Included in other long-term assets Intangible assets Goodwill LIABILITIES Trade and other payables Other current financial liabilities Other current financial liabilities Income taxes payable Other current liabilities Current indebtedness Less: current indebtedness Deferred tax liabilities Other long-term financial liabilities Included in other long-term liabilities Other long-term financial liabilities Other long-term liabilities Share capital Stated value Accumulated earnings Reserves Non-controlling interest Cash flows from operating activities Adjustments to reconcile net income (loss) to cash flows from operating activities: Depreciation Amortization Tax expense (recovery) Interest expense (Gain) loss on changes in fair value of financial instruments Share-based compensation (Gain) loss on disposal of assets Impairment Goodwill impairment loss Pension expense Other Cash flows (used in) generated from investing activities Net proceeds from disposal of assets Cash flows (used in) generated from financing activities Proceeds from indebtedness Proceeds from exercise of stock options Effect of changes in exchange rates on cash and cash equivalents Depreciation Depreciation Amortization Amortization Interest income Deferred revenue amortization Income taxes paid, net of income tax received Interest paid, net of interest received Cash payments related to satellite programs Cash payments related to property and other equipment Investments and other