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Financial Instruments - Additional Information (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Disclosure Of Financial Instruments [Line Items] |  |
Percentage of change in financial assets | 2.00% | 1.00%
Percentage of change in financial liabilities | 3.00% | 1.00%
Restricted short-term investments | $ 664 | $ 550
Allowance for doubtful accounts | 78 |
Maximum exposure to credit risk | 344,659 | $ 108,165
Gross cash proceeds from equity financing | $ 54,876 |
Government Agencies |  |
Disclosure Of Financial Instruments [Line Items] |  |
Portion of receivable | 19.00% | 55.00%
Credit Card Processor And Bill Payment |  |
Disclosure Of Financial Instruments [Line Items] |  |
Portion of receivable | 42.00% | 30.00%
Interest Rate Risk |  |
Disclosure Of Financial Instruments [Line Items] |  |
Restricted short-term investments | $ 65,395 |
Liqudity Risk |  |
Disclosure Of Financial Instruments [Line Items] |  |
Gross cash proceeds from equity financing | $ 470,670 |

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