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Financial Instruments Risk - Narrative (Details) $ / shares in Units, $ / shares in Units, $ in Thousands |  |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
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Aug. 19, 2020 CAD ($) | Aug. 19, 2020 USD ($) | Apr. 29, 2020 CAD ($) | Mar. 06, 2020 CAD ($) | Nov. 25, 2019 CAD ($) $ / shares shares | Sep. 21, 2020 USD ($) | Jun. 30, 2020 CAD ($) $ / shares shares | Jun. 30, 2020 USD ($) $ / shares | Jun. 30, 2019 CAD ($) | Jun. 30, 2020 USD ($) $ / shares shares | Mar. 25, 2020 CAD ($) | Jun. 30, 2019 $ / shares | Jan. 24, 2019 CAD ($) | Jan. 24, 2019 USD ($) $ / shares | Aug. 29, 2018 CAD ($) | Jun. 30, 2018 CAD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of debt converted |  |  |  |  | $ 227,000,000 |  |  |  |  |  |  |  |  |  |  |
Conversion of notes, percent converted |  |  |  |  | 99.00% |  |  |  |  |  |  |  |  |  |  |
Conversion price (in CAD per share) | $ / shares |  |  |  |  | $ 39.40 |  |  |  |  |  |  |  |  |  |  |
Conversion of notes (in shares) | shares |  |  |  |  | 5,761,260 |  |  |  |  |  |  |  |  |  |  |
Repayments of convertible borrowings |  |  |  | $ 2,300,000 |  |  | $ 2,306,000 |  | $ 0 |  |  |  |  |  |  |
Sale of investment, price (in CAD per share) |  |  | $ 0.80 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from disposal of investment in associate |  |  | $ 4,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
ATM supplement, net proceeds |  |  |  |  |  |  | $ 573,400,000 | $ 426,800 |  |  |  |  |  |  |  |
ATM supplement, amount remaining |  |  |  |  |  |  |  |  |  | $ 214,500 |  |  |  |  |  |
Shelf prospectus, amount remaining |  |  |  |  |  |  |  |  |  | $ 60,000 |  |  |  |  |  |
Average share price (in CAD per share) | (per share) |  |  |  |  |  |  | $ 27.85 | $ 20.73 |  |  |  |  |  |  |  |
Restructuring initiatives, expected reduction in SG&A staff |  |  |  |  |  |  | 25.00% |  |  | 25.00% |  |  |  |  |  |
Restructuring initiatives, expected reduction in operational staff |  |  |  |  |  |  | 30.00% |  |  | 30.00% |  |  |  |  |  |
Near-term cash obligations |  |  |  |  |  |  | $ 279,800,000 |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  | 162,179,000 |  | 172,727,000 |  |  |  |  |  |  | $ 76,785,000
Borrowings |  |  |  |  |  |  | 204,209,000 |  | 141,244,000 |  |  |  |  |  |  |
ATM supplement, gross proceeds |  |  |  |  |  | $ 36,670 | $ 585,100,000 | $ 435,500 |  |  |  |  |  |  |  |
ATM program, authorized amount remaining |  |  |  |  |  | 177,800 |  |  |  |  |  |  |  |  |  |
Shelf prospectus, authorized amount remaining |  |  |  |  |  | $ 60,000 |  |  |  |  |  |  |  |  |  |
ATM program, maximum available (in shares) | shares |  |  |  |  |  |  | 17,267,636 |  |  | 17,267,636 |  |  |  |  |  |
Shelf prospectus, maximum available (in shares) | shares |  |  |  |  |  |  | 8,051,530 |  |  | 8,051,530 |  |  |  |  |  |
Share price (in USD per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 12.42 |  |  |  |  |  |
Credit risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivables, non-government wholesale customers |  |  |  |  |  |  | $ 2,200,000 |  | 25,100,000 |  |  |  |  |  |  |
Provision for expected credit losses |  |  |  |  |  |  | $ 1,700,000 |  | 3,100,000 |  |  |  |  |  |  |
Currency risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reasonably possible change in variable |  |  |  |  |  |  | 10.00% |  |  | 10.00% |  |  |  |  |  |
Change in risk variable, impact on net loss |  |  |  |  |  |  | $ 41,800,000 |  | 48,900,000 |  |  |  |  |  |  |
Change in risk variable, impact on comprehensive loss |  |  |  |  |  |  | $ 2,626,000 |  | 20,545,000 |  |  |  |  |  |  |
Interest Rate Risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reasonably possible change in variable |  |  |  |  |  |  | 0.10% |  |  | 0.10% |  |  |  |  |  |
Change in risk variable, impact on net loss |  |  |  |  |  |  | $ 500,000 |  | 200,000 |  |  |  |  |  |  |
Change in risk variable, impact on comprehensive loss |  |  |  |  |  |  | $ 500,000 |  | 200,000.0 |  |  |  |  |  |  |
Price risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reasonably possible change in variable |  |  |  |  |  |  | 10.00% |  |  | 10.00% |  |  |  |  |  |
Change in risk variable, impact on net loss |  |  |  |  |  |  | $ 7,300,000 |  | 23,000,000 |  |  |  |  |  |  |
Change in risk variable, impact on comprehensive loss |  |  |  |  |  |  | 6,100,000 |  | 23,000,000 |  |  |  |  |  |  |
First Amendment to the First Amended and Restated Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum unrestricted cash balance required |  |  |  |  |  |  | 35,000,000 |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | 264,400,000 |  |  |  | $ 264,400,000 |  |  |  |  |
Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000.0 |
Letters of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  | 1,400,000 |  |  |  |  |  |  |  |  |
Facility A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000.0 |
Borrowings |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Credit Facilities B and C | Interest Rate Risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  | 117,504,000 |  |  |  |  |  |  |  |  |
Facility B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000.0 |
Borrowings |  |  |  |  |  |  | 113,800,000 |  |  |  |  |  |  |  |  |
Facility B | Interest Rate Risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  | $ 146,200,000 |  |  |  |  |  |  |
Facility C |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  | 3,700,000 |  |  |  |  |  |  |  |  |
Convertible debenture, January 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price (in CAD per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 86.72 |  |
Share price (in USD per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 12.42 |  | $ 93.84 |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 460,600,000 | $ 345,000 |  |
Convertible debenture, January 2019 | Currency risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  | 460,600,000 |  |  |  |  |  |  |  |  |
Exeter Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from disposal |  |  |  |  |  |  | 8,607,000 |  |  |  |  |  |  |  |  |
Land | Exeter Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from disposal |  |  |  |  |  |  | $ 1,393,000 |  |  |  |  |  |  |  |  |
Land | Jamaica Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from disposal | $ 4,600,000 | $ 3,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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