v3.26.1
Basis of Presentation - Summary of effect of the Restatement Items on the Company's Consolidated Statement of Cash Flows (Details) - CAD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Cash flows from operating activities:                                  
Net loss     $ (44,861) $ (98,083) $ (108,963) $ (105,875) $ (205,664) $ (316,186) $ (49,839) $ (214,839) $ (358,047) $ (108,184) $ (312,922) $ (563,711) $ (262,908) $ (508,878) $ (712,206)
Net loss from continuing operations $ (58,345) $ (4,978) (44,861) (98,083) (112,220) (107,928) (219,143) (139,548) (49,839) (220,149) (150,117) (108,184) (318,232) (369,260) (262,908) (514,901) (520,093)
Non-cash fair value adjustments and charges related to settlement of unsecured senior notes     13,383     58,530     (5,898) 106,698 35,824 21,637 159,186 168,705   324,175 196,879
Net cash used in operating activities - continuing operations           (51,780)       (105,632) (172,613)   (132,598) (205,961) (63,806) (165,750) (228,421)
Net cash used in operating activities     (10,337)     (51,780)     (28,316) (105,632) (227,322) (45,552) (132,598) (259,891) $ (63,806) (165,750) (281,950)
As Previously Reported                                  
Cash flows from operating activities:                                  
Net loss     (41,527) (121,896) (128,293) (127,138) (216,797) (324,800) (43,166) (255,431) (366,661) (105,793) (377,327) (583,458)   (598,115) (675,795)
Net loss from continuing operations (62,627) (1,639) (41,527) (121,896) (131,550) (129,191) (230,276) (148,162) (43,166) (260,741) (158,731) (105,793) (382,637) (389,007)   (604,138) (483,682)
Non-cash fair value adjustments and charges related to settlement of unsecured senior notes     10,049     79,793     (12,571) 147,290 44,438 19,246 223,591 188,452   413,412 160,468
Net cash used in operating activities - continuing operations           (51,780)       (105,632) (172,613)   (132,598) (205,961)   (165,750) (228,421)
Net cash used in operating activities     (10,337)     (51,780)     (28,316) (105,632) (227,322) (45,552) (132,598) (259,891)   (165,750) (281,950)
Restatement Adjustment                                  
Cash flows from operating activities:                                  
Net loss     (3,334) 23,813 19,330 21,263 11,133 8,614 (6,673) 40,592 8,614 (2,391) 64,405 19,747   89,237 (36,411)
Net loss from continuing operations $ 4,282 $ (3,339) (3,334) $ 23,813 $ 19,330 21,263 $ 11,133 $ 8,614 (6,673) 40,592 8,614 (2,391) 64,405 19,747   89,237 (36,411)
Non-cash fair value adjustments and charges related to settlement of unsecured senior notes     3,334     (21,263)     $ 6,673 (40,592) (8,614) $ 2,391 (64,405) (19,747)   (89,237) 36,411
Net cash used in operating activities - continuing operations           0       0 0   0 0   0 0
Net cash used in operating activities     $ 0     $ 0       $ 0 $ 0   $ 0 $ 0   $ 0 $ 0