INCOME TAXES - Narrative (Details) - CAD ($) $ in Millions		12 Months Ended
Feb. 16, 2024	Mar. 31, 2024	Mar. 31, 2023
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Current year		$ 74.0	$ 49.9
Origination and reversal of temporary differences		(233.3)	14.2
Income tax recovery	$ 10.2	18.7	1.6
Net deferred tax assets		199.4	81.5
Deferred income tax liability		3,065.5	2,866.1
Deductible temporary differences		139.6	115.5
Unrecognized		195.2
Strategic Aerospace and Defence Initiative (SADI) Program
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Current year		57.4
Origination and reversal of temporary differences		(61.9)
No expiry date
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized		140.4
Capital Losses \| No expiry date
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized		$ 180.2	$ 19.9

Tax Expense (Income) Relating To The Profit (Loss) Arising From Discontinued Operations

No definition available.

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- Definition

The amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period.

+ References

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- Definition

The amount of deductible temporary differences for which no deferred tax asset is recognised in the statement of financial position. [Refer: Temporary differences [member]]

+ References

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- Definition

The amount of deferred tax asset when: (a) the utilisation of the deferred tax asset is dependent on future taxable profits in excess of the profits arising from the reversal of existing taxable temporary differences; and (b) the entity has suffered a loss in either the current or preceding period in the tax jurisdiction to which the deferred tax asset relates. [Refer: Temporary differences [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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- Definition

The amount of deferred tax expense or income relating to the creation or reversal of temporary differences. [Refer: Temporary differences [member]; Deferred tax expense (income)]

+ References

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

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The aggregate amount of temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements, for which deferred tax liabilities have not been recognised as a result of satisfying both of the following conditions: (a) the parent, investor, joint venturer or joint operator is able to control the timing of the reversal of the temporary difference; and (b) it is probable that the temporary difference will not reverse in the foreseeable future. [Refer: Associates [member]; Subsidiaries [member]; Temporary differences [member]; Investments in subsidiaries reported in separate financial statements]

+ References

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- Definition

The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]]

+ References

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