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Share Capital - Equity Raises - Summary of Equity Financing (Details) - CAD ($) $ in Thousands |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 07, 2018 | Nov. 02, 2017 | Jul. 21, 2017 | Mar. 22, 2017 | Dec. 22, 2016 | Aug. 24, 2016 | Apr. 15, 2016 | Mar. 31, 2018 | Mar. 31, 2017
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |  |  |  |  |  |  |
Equity raise share issuances, shares | 5,800,000 |  | 3,105,590 | 2,500,000 | 5,662,000 | 9,453,000 | 5,002,500 | 27,782,491 | 22,617,500
Equity raise share issuances | $ 192,065 |  | $ 24,922 | $ 24,160 | $ 56,131 | $ 32,096 | $ 10,799 | $ 390,752 | $ 123,186
Greenstar investment |  |  |  |  |  |  |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |  |  |  |  |  |  |
Equity raise share issuances, shares |  | 18,876,901 |  |  |  |  |  |  |
Equity raise share issuances |  | $ 173,765 |  |  |  |  |  |  |

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