Financing Costs - Additional Information (Detail) - CAD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Sep. 30, 2021 |
Jun. 30, 2021 |
|
| Line of Credit Facility [Line Items] | ||
| Interest bearing loan, maximum borrowing capacity | $ 1,300 | |
| Repayments of Debt | $ 75 | |
| Line Of Credit Facility Due May Two Thousand And Twenty Three [Member] | ||
| Line of Credit Facility [Line Items] | ||
| Debt instrument, maturity date | May 31, 2023 | |
| Interest bearing loan, maximum borrowing capacity | $ 750 | |
| Short Term Line Of Credit Facility Due June Two Thousand And Twenty Two [Member] | ||
| Line of Credit Facility [Line Items] | ||
| Debt instrument, maturity date | Jun. 30, 2022 | |
| Interest bearing loan, maximum borrowing capacity | $ 300 | |