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Share Capital - Summary of Changes in ESOP Options (Details) | 12 Months Ended
--- | ---
Mar. 31, 2018 CAD ($) shares | Mar. 31, 2017 CAD ($) shares
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |
Weighted average exercise price at end of year | $ 12.95 |
ESOP |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |
Options issued at beginning of year | shares | 10,044,112 | 8,446,182
Number of option granted | shares | 12,832,237 | 4,337,701
Options exercised | shares | (3,912,946) | (4,010,865)
Options forfeited/cancelled | shares | (1,942,001) | (1,146,008)
Options issued at end of year | shares | 17,245,835 | 10,044,112
Weighted average exercise price at beginning of year | $ 3.97 | $ 2.05
Weighted average exercise price - Options granted | 16.50 | 6.23
Weighted average exercise price - Options exercised | 2.82 | 1.74
Weighted average exercise price - Options forfeited/cancelled | 9.32 | 2.78
Weighted average exercise price at end of year | $ 12.95 | $ 3.97
ESOP | Mettrum |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |
Replacement options issued as a result of acquisition | shares |  | 2,417,102
Weighted average exercise price - Replacement options issued as a result of acquisition |  | $ 2.35
ESOP | R Trees |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |
Replacement options issued as a result of acquisition | shares | 224,433 |
Weighted average exercise price - Replacement options issued as a result of acquisition | $ 3.18 |

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