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Equity Method Investments - CHI and BCT - Additional Information (Details) - CAD ($)
$ in Thousands
12 Months Ended
Sep. 28, 2018
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Sep. 27, 2018
Aug. 03, 2018
Schedule Of Equity Method Investments [Line Items]            
Equity financing   $ 5,135 $ 36,896 $ 26,179    
CHI and BCT            
Schedule Of Equity Method Investments [Line Items]            
Ownership percentage 42.20%       50.00% 50.00%
Equity investment fair value           $ 8,563
Equity financing $ 3,986