Other Financial Assets - Additional Information (Details) - CAD ($) $ in Thousands |
Mar. 31, 2026 |
Dec. 31, 2025 |
Sep. 30, 2025 |
Jun. 30, 2025 |
Mar. 31, 2025 |
Dec. 31, 2024 |
Sep. 30, 2024 |
Jun. 30, 2024 |
Mar. 31, 2024 |
Dec. 31, 2023 |
Sep. 30, 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Schedule Of Investments [Line Items] | |||||||||||
| Common stock value | $ 9,233,577 | $ 9,155,946 | $ 9,064,336 | $ 8,822,530 | $ 8,782,405 | $ 8,656,493 | $ 8,476,669 | $ 8,379,131 | $ 8,219,322 | $ 8,209,271 | $ 8,209,370 |
| X | ||||||||||
- Definition Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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