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Convertible Debentures (Details)
 12 Months Ended
Mar. 06, 2020
CAD ($)
Nov. 25, 2019
CAD ($)
$ / shares
shares
Jan. 24, 2019
CAD ($)
day
shares
Jan. 24, 2019
USD ($)
day
shares
Mar. 09, 2018
CAD ($)
day
$ / shares
Nov. 28, 2017
CAD ($)
day
$ / shares
Jun. 30, 2020
CAD ($)
bps
Jun. 30, 2019
CAD ($)
bps
shares
Jun. 30, 2020
$ / shares
Nov. 30, 2019
$ / shares
Jun. 30, 2019
$ / shares
Jan. 24, 2019
USD ($)
$ / shares
Borrowings, Convertible Debentures [Roll Forward]                        
Conversion of debt             $ (391,911,000) $ (1,019,000)        
Current portion             (32,110,000) (235,909,000)        
Long-term portion             294,928,000 267,672,000        
Conversion price (in CAD per share) | $ / shares   $ 39.40                    
Conversion of notes, percent converted   99.00%                    
Conversion of notes (in shares) | shares   5,761,260                    
Loss on induced conversion of debenture               0        
Repayment of convertible debenture $ (2,300,000)           (2,306,000) 0        
Financial liabilities at amortised cost             204,209,000 141,244,000        
Derivative liability             1,827,000 177,395,000        
Unrealized gain on derivative liability             (175,568,000) 8,167,000        
Share price (in USD per share) | $ / shares                 $ 12.42      
Convertible debenture                        
Borrowings, Convertible Debentures [Roll Forward]                        
Convertible debentures, beginning balance             503,581,000 191,528,000        
Issued               460,610,000        
Conversion option portion               (169,228,000)        
Financing fees               (14,965,000)        
Conversion of debt             (219,614,000) (1,018,000)        
Interest paid             (35,737,000) (11,535,000)        
Accretion             36,799,000 31,654,000        
Accrued interest             33,465,000 22,397,000        
Principal repayment             (2,306,000)          
Unrealized gain on foreign exchange             10,850,000 (5,862,000)        
Convertible debentures, ending balance             327,038,000 503,581,000        
Current portion             (32,110,000) (235,909,000)        
Long-term portion             294,928,000 267,672,000        
Convertible debenture, November 2017                        
Borrowings, Convertible Debentures [Roll Forward]                        
Convertible debentures, beginning balance             0 637,000        
Issued               0        
Conversion option portion               0        
Financing fees               0        
Conversion of debt             0 (640,000)        
Interest paid             0 (69,000)        
Accretion             0 34,000        
Accrued interest             0 38,000        
Principal repayment             0          
Unrealized gain on foreign exchange             0 0        
Convertible debentures, ending balance             0 0        
Current portion             0 0        
Long-term portion             0 0        
Notional amount           $ 115,000,000.0            
Borrowings, interest rate           6.00%            
Conversion price (in CAD per share) | $ / shares           $ 78            
Conversion, stock price trigger (in CAD per share) | $ / shares           $ 108            
Consecutive trading days | day           10            
Convertible debenture, March 2018                        
Borrowings, Convertible Debentures [Roll Forward]                        
Convertible debentures, beginning balance             212,094,000 190,891,000        
Issued               0        
Conversion option portion               0        
Financing fees               0        
Conversion of debt             (219,614,000) (378,000)        
Interest paid             (7,948,000) (11,466,000)        
Accretion             9,857,000 21,574,000        
Accrued interest             7,917,000 11,473,000        
Principal repayment             (2,306,000)          
Unrealized gain on foreign exchange             0 0        
Convertible debentures, ending balance             0 212,094,000        
Current portion             0 (212,094,000)        
Long-term portion             0 0        
Notional amount         $ 230,000,000.0              
Borrowings, interest rate         5.00%              
Conversion price (in CAD per share) | $ / shares         $ 156.60              
Conversion, stock price trigger (in CAD per share) | $ / shares         $ 204              
Consecutive trading days | day         10              
Borrowings maturity, term         2 years              
Temporarily amended conversion price (in CAD per share) | $ / shares                   $ 39.40    
Discount on average daily VWAP of common shares, percent                   0.06    
Conversion of notes, percent converted   99.00%                    
Remaining principal amount of debenture   $ 227,000,000           $ 400,000        
Conversion of notes (in shares) | shares   5,761,260           2,765        
Interest expense on borrowings   $ 7,900,000                    
Payment for interest previously incurred on convertible borrowings   4,700,000                    
Payment for interest not yet incurred on convertible borrowings   $ 3,200,000                    
Loss on induced conversion of debenture             (172,300,000)          
Repayment of convertible debenture $ (2,300,000)                      
Convertible debenture, January 2019                        
Borrowings, Convertible Debentures [Roll Forward]                        
Convertible debentures, beginning balance             291,487,000 $ 0        
Issued               460,610,000        
Conversion option portion               (169,228,000)        
Financing fees               (14,965,000)        
Conversion of debt             0 0        
Interest paid             (27,789,000) 0        
Accretion             26,942,000 10,046,000        
Accrued interest             25,548,000 10,886,000        
Principal repayment             0          
Unrealized gain on foreign exchange             10,850,000 (5,862,000)        
Convertible debentures, ending balance             327,038,000 291,487,000        
Current portion             (32,110,000) (23,815,000)        
Long-term portion             294,928,000 267,672,000        
Notional amount     $ 460,600,000                 $ 345,000,000
Borrowings, interest rate     5.50%                 5.50%
Conversion price (in CAD per share) | $ / shares                       $ 86.72
Conversion, number of common shares (in shares) | shares     11.53 11.53                
Principal amount used for conversion rate                       $ 1,000
Proceeds from borrowings     $ 445,600,000 $ 334,700,000                
Transaction costs     $ 15,000,000                  
Share price (in USD per share) | $ / shares                 $ 12.42   $ 93.84  
Convertible debenture, January 2019 | On and after February 28, 2022 and prior to February 28, 2024                        
Borrowings, Convertible Debentures [Roll Forward]                        
Conversion price (in CAD per share) | $ / shares                       $ 112.74
Consecutive trading days | day     30 30                
Trading days | day     20 20                
Conversion, threshold percentage of stock price trigger     130.00% 130.00%                
Convertible debenture, January 2019 | On and after February 28, 2024                        
Borrowings, Convertible Debentures [Roll Forward]                        
Consecutive trading days | day     20 20                
Trading days | day     10 10                
Conversion, dollar unit per redemption share     $ 1,000 $ 1,000                
Convertible debenture, January 2019 | On and after February 28, 2024 | Top of range                        
Borrowings, Convertible Debentures [Roll Forward]                        
Redemption, threshold days | day     60 60                
Convertible debenture, January 2019 | On and after February 28, 2024 | Bottom of range                        
Borrowings, Convertible Debentures [Roll Forward]                        
Redemption, threshold days | day     30 30                
Convertible debenture, January 2019 | Upon the Occurrence of Certain Customary Events                        
Borrowings, Convertible Debentures [Roll Forward]                        
Redemption percentage of principal amount     100.00% 100.00%                
Convertible Senior Notes | Convertible debenture, January 2019                        
Borrowings, Convertible Debentures [Roll Forward]                        
Financial liabilities at amortised cost     $ 276,400,000                  
Debentures, accrued interest             8,600,000 10,900,000        
Conversion Option | Convertible debenture, January 2019                        
Borrowings, Convertible Debentures [Roll Forward]                        
Amount of equity component     $ (169,200,000)                 $ 126,800,000
Derivative liability             1,800,000 177,400,000        
Unrealized gain on derivative liability             $ (175,600,000) $ 8,200,000        
Historical volatility for shares | Convertible debenture, January 2019                        
Borrowings, Convertible Debentures [Roll Forward]                        
Significant unobservable input, liabilities             0.75 0.60        
Credit spread | Convertible debenture, January 2019                        
Borrowings, Convertible Debentures [Roll Forward]                        
Significant unobservable input, liabilities | bps             3,297 897        
Stock borrow rate | Convertible debenture, January 2019                        
Borrowings, Convertible Debentures [Roll Forward]                        
Significant unobservable input, liabilities             0.50 0.15