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Share Capital and Warrants - Additional Information (Detail) - $ / shares | 3 Months Ended | 9 Months Ended | 60 Months Ended |
--- | --- | --- | --- | ---
Dec. 29, 2021 | Sep. 29, 2021 | Mar. 31, 2021 | Sep. 30, 2021 | Mar. 30, 2026 | Dec. 31, 2020
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |
Maximum percentage of preferred stock upon issuance or outstanding of common stock |  |  |  | 20.00% |  |
Stock Option Plan |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |
Shares available for future issuance (in shares) |  |  |  | 30,000,000 |  | 27,000,000
Preferred Shares |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |
Shares outstanding (in shares) |  |  |  | 36,000,000 |  | 0
Preferred Shares | Series 1 First Preferred Shares |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |
Preference shares converted from Series 1 to Series 2 |  |  | 274,000 |  |  |
Redeemable preferred shares, conversion term |  |  | 5 years |  |  |
Dividend Rate |  |  | 2.40% | 2.58% | 2.58% |
Shares outstanding (in shares) |  |  |  | 10,740,000 |  |
Preferred Shares | Series 1 First Preferred Shares | Government of Canada Bond |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |
Dividend Rate |  |  |  |  | 0.85% |
Dividend rate, basis spread |  |  | 1.73% |  |  |
Preferred Shares | Series 2 First Preferred Shares |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |
Dividend Rate | 1.92% | 1.84% |  | 1.92% |  |
Preference shares converted from Series 2 to Series 1 |  |  | 578,000 |  |  |
Shares outstanding (in shares) |  |  |  | 1,260,000 |  |
Preferred Shares | Series 2 First Preferred Shares | Government of Canada Bond |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |
Dividend rate, basis spread |  |  | 1.73% |  |  |
Preferred Shares | Series 3 First Preferred Shares |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |
Redeemable preferred shares, conversion term |  |  |  | 5 years |  |
Dividend Rate |  |  |  | 4.69% |  |
Dividend yield, term two |  |  |  | 5 years |  |
Shares outstanding (in shares) |  |  |  | 10,000,000 |  |
Preferred Shares | Series 3 First Preferred Shares | Government of Canada Bond |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |
Dividend rate, basis spread |  |  |  | 3.13% |  |
Preferred Shares | Series 3 First Preferred Shares | 90-Day Government of Canada Treasury Bills |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |
Dividend rate, basis spread |  |  |  | 3.13% |  |
Preferred Shares | Series 5 First Preferred Shares |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |
Redeemable preferred shares, conversion term |  |  |  | 5 years |  |
Dividend Rate |  |  |  | 4.59% |  |
Dividend yield, term two |  |  |  | 5 years |  |
Shares outstanding (in shares) |  |  |  | 8,000,000 |  |
Preferred Shares | Series 5 First Preferred Shares | Government of Canada Bond |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |
Dividend rate, basis spread |  |  |  | 3.57% |  |
Preferred Shares | Series 5 First Preferred Shares | 90-Day Government of Canada Treasury Bills |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |
Dividend rate, basis spread |  |  |  | 3.57% |  |
Preferred Shares | Series 7 First Preferred Shares |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |
Redeemable preferred shares, conversion term |  |  |  | 5 years |  |
Dividend Rate |  |  |  | 3.94% |  |
Dividend yield, term two |  |  |  | 5 years |  |
Shares outstanding (in shares) |  |  |  | 6,000,000 |  |
Preferred Shares | Series 7 First Preferred Shares | Government of Canada Bond |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |
Dividend rate, basis spread |  |  |  | 3.52% |  |
Preferred Shares | Series 7 First Preferred Shares | 90-Day Government of Canada Treasury Bills |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |
Dividend rate, basis spread |  |  |  | 3.52% |  |
Second Preferred Shares |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |
Shares outstanding (in shares) |  |  |  | 0 |  | 0
Share Purchase Warrants |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |
Shares outstanding (in shares) |  |  |  | 65,219,000 |  | 0
Exercise price of warrants issued (in CAD per share) |  |  |  | $ 6.54 |  |

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