INVENTORIES - Summary of Inventories (Details) - CAD ($) $ in Millions |
Mar. 31, 2026 |
Mar. 31, 2025 |
|---|---|---|
| Inventories [Abstract] | ||
| Work in progress | $ 246.6 | $ 348.4 |
| Raw materials, supplies and manufactured products | 208.2 | 246.6 |
| Total inventories | $ 454.8 | $ 595.0 |
| X | ||||||||||
- Definition Inventories [Abstract] No definition available.
|
| X | ||||||||||
- Definition A classification of current inventory representing the amount of current raw materials and current production supplies. [Refer: Current production supplies; Current raw materials] Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition The amount of current inventories. [Refer: Inventories] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition A classification of current inventory representing the amount of assets currently in production, which require further processes to be converted into finished goods or services. [Refer: Current finished goods; Inventories] Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|