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Supplementary Cash Flow Information - Summary of Cash and Cash Equivalents (Details) - CAD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Disclosure Of Cash Flow Statement [Abstract]      
Cash $ 322,560 $ 16,700  
Short-term guaranteed investment certificates   85,100  
Total cash and cash equivalents $ 322,560 $ 101,800 $ 15,397