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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