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Assets Held for Sale and Discontinued Operations - Assets Held for Sale (Details) $ in Millions |  | 1 Months Ended | 5 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 19, 2020 CAD ($) | Aug. 19, 2020 USD ($) | Nov. 25, 2019 CAD ($) | Nov. 25, 2019 CAD ($) | Jun. 30, 2020 CAD ($) property | Mar. 31, 2020 CAD ($)
Disclosure Of Non-current Assets Held for Sale [Line Items] |  |  |  |  |  |
Impairment loss recognised in profit or loss, property, plant and equipment |  |  |  |  | $ 148,234,000 |
Number of properties listed for sale | property |  |  |  |  | 2 |
Exeter Property |  |  |  |  |  |
Disclosure Of Non-current Assets Held for Sale [Line Items] |  |  |  |  |  |
Proceeds from disposal |  |  |  |  | $ 8,607,000 |
Impairment loss recognised in profit or loss, property, plant and equipment |  |  | $ 11,000,000 | $ 1,400,000 |  |
(Loss) gain on disposal |  |  |  |  | (23,000) |
Exeter Property | Land |  |  |  |  |  |
Disclosure Of Non-current Assets Held for Sale [Line Items] |  |  |  |  |  |
Proceeds from disposal |  |  |  |  | 1,393,000 |
(Loss) gain on disposal |  |  |  |  | (41,000) |
Exeter Property | Building & Improvements |  |  |  |  |  |
Disclosure Of Non-current Assets Held for Sale [Line Items] |  |  |  |  |  |
Proceeds from disposal |  |  |  |  | 7,214,000 |
(Loss) gain on disposal |  |  |  |  | 18,000 |
Jamaica Property | Land |  |  |  |  |  |
Disclosure Of Non-current Assets Held for Sale [Line Items] |  |  |  |  |  |
Proceeds from disposal | $ 4,600,000 | $ 3.5 |  |  |  |
Impairment loss recognised in profit or loss, property, plant and equipment |  |  |  |  | 0 |
Non-current assets or disposal groups classified as held for sale |  |  |  |  | $ 4,200,000 |
Latin America Properties | Land |  |  |  |  |  |
Disclosure Of Non-current Assets Held for Sale [Line Items] |  |  |  |  |  |
Number of properties listed for sale | property |  |  |  |  | 2 |
Non-current assets or disposal groups classified as held for sale |  |  |  |  | $ 2,000,000 |
At fair value | Exeter Property |  |  |  |  |  |
Disclosure Of Non-current Assets Held for Sale [Line Items] |  |  |  |  |  |
Non-current assets or disposal groups classified as held for sale |  |  | 18,234,000 | 18,234,000 |  | $ 8,630,000
At fair value | Exeter Property | Land |  |  |  |  |  |
Disclosure Of Non-current Assets Held for Sale [Line Items] |  |  |  |  |  |
Non-current assets or disposal groups classified as held for sale |  |  | 1,919,000 | 1,919,000 |  | 1,434,000
At fair value | Exeter Property | Building & Improvements |  |  |  |  |  |
Disclosure Of Non-current Assets Held for Sale [Line Items] |  |  |  |  |  |
Non-current assets or disposal groups classified as held for sale |  |  | 16,315,000 | 16,315,000 |  | 7,196,000
At fair value | Jamaica Property | Land |  |  |  |  |  |
Disclosure Of Non-current Assets Held for Sale [Line Items] |  |  |  |  |  |
Non-current assets or disposal groups classified as held for sale |  |  |  |  | $ 4,300,000 |
Net book value | Exeter Property |  |  |  |  |  |
Disclosure Of Non-current Assets Held for Sale [Line Items] |  |  |  |  |  |
Non-current assets or disposal groups classified as held for sale |  |  | 19,677,000 | 19,677,000 |  |
Net book value | Exeter Property | Land |  |  |  |  |  |
Disclosure Of Non-current Assets Held for Sale [Line Items] |  |  |  |  |  |
Non-current assets or disposal groups classified as held for sale |  |  | 2,653,000 | 2,653,000 |  |
Net book value | Exeter Property | Building & Improvements |  |  |  |  |  |
Disclosure Of Non-current Assets Held for Sale [Line Items] |  |  |  |  |  |
Non-current assets or disposal groups classified as held for sale |  |  | 17,024,000 | 17,024,000 |  |
Impairment | Exeter Property |  |  |  |  |  |
Disclosure Of Non-current Assets Held for Sale [Line Items] |  |  |  |  |  |
Non-current assets or disposal groups classified as held for sale |  |  | (1,443,000) | (1,443,000) |  | (9,604,000)
Impairment | Exeter Property | Land |  |  |  |  |  |
Disclosure Of Non-current Assets Held for Sale [Line Items] |  |  |  |  |  |
Non-current assets or disposal groups classified as held for sale |  |  | (734,000) | (734,000) |  | (485,000)
Impairment | Exeter Property | Building & Improvements |  |  |  |  |  |
Disclosure Of Non-current Assets Held for Sale [Line Items] |  |  |  |  |  |
Non-current assets or disposal groups classified as held for sale |  |  | $ (709,000) | $ (709,000) |  | $ (9,119,000)

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