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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 |  |  |  |

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