Supplemental Cash Flow Information - Narrative (Details) - CAD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Statement of cash flows, additional disclosures [Abstract] | ||
| Collateral held for letters of credit and corporate credit cards | $ 2.6 | $ 3.4 |
| Collateral held for international subsidiaries | 0.1 | 0.1 |
| Insurance coverage for company management | $ 45.1 | $ 43.9 |