INCOME TAXES - Reconciliation of Income Taxes (Details) - CAD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Income Tax [Abstract] | ||
| Earnings before income taxes | $ 400.2 | $ 513.7 |
| Canadian statutory income tax rates (in percent) | 26.50% | 26.50% |
| Income taxes at Canadian statutory rates | $ 106.1 | $ 136.2 |
| Effect of differences in tax rates in other jurisdictions | (13.6) | 1.8 |
| Tax benefits not previously recognized and unrecognized tax benefits | (0.5) | (6.8) |
| Non-taxable gain on fair value remeasurement of SIMCOM | 0.0 | (21.9) |
| Non-deductible expenses | 5.5 | 0.0 |
| Tax impact on after tax profit of equity accounted investees | (17.7) | (18.5) |
| Prior years' tax adjustments | (1.9) | 2.8 |
| Other | (0.4) | 5.1 |
| Income tax expense | $ 77.5 | $ 98.7 |
| Effective tax rate (in percent) | 19.00% | 19.00% |
| X | ||||||||||
- Definition Income Tax [Abstract] No definition available.
|
| X | ||||||||||
- Definition Tax Benefits Not Previously Recognized And Unrecognized Tax Benefits No definition available.
|
| X | ||||||||||
- Definition Tax Effect Of Non-Taxable Gain On Fair Value Measurement Of Interest In Entity No definition available.
|
| X | ||||||||||
- Definition Tax Effect Of Prior Years' Tax Adjustments No definition available.
|
| X | ||||||||||
- Definition Tax Impact On After-Tax Profit Of Equity Accounted Investees No definition available.
|
| X | ||||||||||
- Definition The amount of profit (loss) for a period before deducting tax expense. [Refer: Profit (loss)] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The applicable income tax rate. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The tax expense (income) divided by the accounting profit. [Refer: Accounting profit] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- References Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that the entity does not separately disclose in the same statement or note. [Refer: Accounting profit; Applicable tax rate] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to expenses not deductible in determining taxable profit (tax loss). [Refer: Accounting profit] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to foreign tax rates. [Refer: Accounting profit] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The product of the accounting profit multiplied by the applicable tax rate(s). [Refer: Accounting profit; Applicable tax rate] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|