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Financial instruments - Currency Risk Exposure (Details) - Currency risk - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure $ (14,087) $ (30,720)
Cash and cash equivalents and restricted cash    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure 30,451 22,131
Trade and other receivables    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure 12,798 10,154
Accounts payable and accrued liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (33,101) (40,620)
Accrued payroll taxes on share-based compensation    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (789) (3,064)
Lease liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (23,446) (19,321)
CAD    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (14,856) (21,384)
Impact of 1% Strengthening in the closing exchange rate on loss before tax (1,347) (590)
CAD | Cash and cash equivalents and restricted cash    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure 13,885 3,141
CAD | Trade and other receivables    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure 3,454 5,122
CAD | Accounts payable and accrued liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (18,508) (13,729)
CAD | Accrued payroll taxes on share-based compensation    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (287) (1,816)
CAD | Lease liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (13,400) (14,102)
EUR    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (116) (4,081)
Impact of 1% Strengthening in the closing exchange rate on loss before tax (1,092) (84)
EUR | Cash and cash equivalents and restricted cash    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure 6,270 15,913
EUR | Trade and other receivables    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure 4,086 2,740
EUR | Accounts payable and accrued liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (5,755) (18,898)
EUR | Accrued payroll taxes on share-based compensation    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (270) (622)
EUR | Lease liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (4,447) (3,214)
GBP    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (3,113) (2,366)
Impact of 1% Strengthening in the closing exchange rate on loss before tax (383) 20
GBP | Cash and cash equivalents and restricted cash    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure 1,338 470
GBP | Trade and other receivables    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure 1,472 469
GBP | Accounts payable and accrued liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (1,466) (2,154)
GBP | Accrued payroll taxes on share-based compensation    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (142) (309)
GBP | Lease liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (4,315) (842)
AUD    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure 1,833 (3,663)
Impact of 1% Strengthening in the closing exchange rate on loss before tax (512) (20)
AUD | Cash and cash equivalents and restricted cash    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure 2,522 958
AUD | Trade and other receivables    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure 2,675 793
AUD | Accounts payable and accrued liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (2,834) (4,529)
AUD | Accrued payroll taxes on share-based compensation    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (53) (239)
AUD | Lease liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (477) (646)
NZD    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (255) (526)
Impact of 1% Strengthening in the closing exchange rate on loss before tax (167) (6)
NZD | Cash and cash equivalents and restricted cash    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure 2,651 0
NZD | Trade and other receivables    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure 49 0
NZD | Accounts payable and accrued liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (2,407) (484)
NZD | Accrued payroll taxes on share-based compensation    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure 0 (42)
NZD | Lease liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (548) 0
Other    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure 2,420 1,300
Impact of 1% Strengthening in the closing exchange rate on loss before tax (166) (12)
Other | Cash and cash equivalents and restricted cash    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure 3,785 1,649
Other | Trade and other receivables    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure 1,062 1,030
Other | Accounts payable and accrued liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (2,131) (826)
Other | Accrued payroll taxes on share-based compensation    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (37) (36)
Other | Lease liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure $ (259) $ (517)