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Shareholders' capital - Additional Information (Detail) $ / shares in Units, $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 17 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 17, 2020 CAD ($) | Jul. 17, 2020 USD ($) $ / shares shares | May 15, 2020 USD ($) $ / shares shares | Aug. 13, 2020 shares | Jun. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) $ / shares $ / shares shares | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) $ / shares shares | Jul. 17, 2020 $ / shares shares
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Options exercised (in shares) |  |  |  |  |  |  | 2,386,275 |  |  |  |
Options exercised (CAD per share) | $ / shares |  |  |  |  |  |  |  | $ 12.52 |  |  |
Shares issued from treasury for option exercise (in shares) |  |  |  |  |  |  | 441,342 |  |  |  |
Options settled at cash value for payment of the exercise price and for tax withholdings (in shares) |  |  |  |  |  |  | 384,517 |  |  |  |
Total share-based compensation expense | $ |  |  |  |  | $ 9,997,000 | $ 2,566,000 | $ 11,640,000 |  | $ 4,473,000 |  |
Common shares |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Options settled at cash value for payment of the exercise price and for tax withholdings (in shares) |  |  |  |  | 7,377 |  | 1,637,489 |  |  |  |
Treasury Stock, Common |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares issued from treasury for option exercise (in shares) |  |  |  |  | 6,401 |  | 748,786 |  |  |  |
Performance Share Units |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  | 825,859 |  | 825,859 | 825,859 |  | 825,859 |
Unrecognized compensation costs, non-vested awards | $ |  |  |  |  | $ 13,482,000 |  | $ 13,482,000 | $ 13,482,000 |  | $ 13,482,000 |
Unrecognized compensation costs, non-vested options, period of recognition |  |  |  |  |  |  | 1 year 4 months 13 days |  |  |  |
Bonus Deferral Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares issued during period (in shares) |  |  |  |  | 116,921 |  |  |  |  |  |
Deferred Share Units |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  | 13,778 |  | 13,778 | 13,778 |  | 13,778 |
Shares issued during period (in shares) |  |  |  |  |  |  | 21,343 |  |  |  |
Employee Stock Option |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation costs, non-vested options | $ |  |  |  |  | $ 1,639,000 |  | $ 1,639,000 | $ 1,639,000 |  | $ 1,639,000 |
Unrecognized compensation costs, non-vested options, period of recognition |  |  |  |  |  |  | 1 year 29 days |  |  |  |
Executive |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Options granted (in shares) |  |  |  |  |  |  | 948,347 |  |  |  |
Options granted (CAD per share) | $ / shares |  |  |  |  |  |  | $ 16.70 |  |  |  |
Options expiration period |  |  |  |  |  |  | 8 years |  |  |  |
Executive | PSU's, RSU's and Retirement RSU's |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Options granted (in shares) |  |  |  |  |  |  | 775,340 |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  | 57,465,500 |  |  |  |  |  |  |  |  | 57,465,500
Shares issued, price per share (CAD per share) | (per share) |  | $ 12.60 |  |  |  |  |  |  |  |  | $ 17.10
Sale Of Stock, Consideration Received On Transaction, Gross | $ 982,660 | $ 723,926,000 |  |  |  |  |  |  |  |  |
Sale Of Stock, Issuance Costs | $ 32,977 | $ 24,294,000 |  |  |  |  |  |  |  |  |
Subsequent Event | Employee | Performance Share Units |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Options granted (in shares) |  |  |  | 321,752 |  |  |  |  |  |  |
ATM Equity Program |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Value of Shares Issued in Transaction | $ |  |  | $ 500,000,000 |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  | 8,664,563 |  |  |  |  |  |  |  |
Shares issued, price per share (CAD per share) | $ / shares |  |  | $ 13.92 |  | $ 13.69 |  | $ 13.69 | $ 13.69 |  | $ 13.69 |
Sale Of Stock, Consideration Received On Transaction, Gross | $ |  |  | $ 120,634,000 |  |  |  |  |  |  | $ 142,668,000 |
Sale Of Stock, Consideration Received On Transaction, Net of Commissions | $ |  |  | 119,126,000 |  |  |  |  |  |  |  |
Sale of Stock, Other Related costs | $ |  |  | $ 761,000 |  |  |  |  |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction |  |  |  |  |  |  |  |  |  | 10,421,362 |
Sale of Stock, Consideration Received on Transaction | $ |  |  |  |  |  |  |  |  |  | $ 140,830,000 |
Sale of Stock, Program Costs | $ |  |  |  |  |  |  |  |  |  | $ 2,883,000 |
Other Net Losses |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total share-based compensation expense | $ |  |  |  |  | $ 6,952,000 |  |  |  |  |  |
Succession and Retirement Expense | $ |  |  |  |  | 963,000 |  | $ 963,000 |  |  |  |
Other Net Losses | Retirement Restricted Share Units |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total share-based compensation expense | $ |  |  |  |  | 3,049,000 |  | 3,049,000 |  |  |  |
Other Net Losses | Performance Share Units |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total share-based compensation expense | $ |  |  |  |  | $ 2,940,000 |  | $ 2,940,000 |  |  |  |

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