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Financial instruments - Currency Risk Exposure (Details) - Currency risk - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash and cash equivalents and restricted cash    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure $ (16,142) $ (30,451)
Trade and other receivables    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (25,556) (12,798)
Accounts payable and accrued liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (29,355) (33,101)
Other long-term liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (738) (789)
Lease liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (22,095) (23,446)
Net financial position exposure    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure 10,490 14,087
CAD    
Disclosure of detailed information about financial instruments [line items]    
Impact of 1% Strengthening in the closing exchange rate on loss before tax (84) (1,347)
CAD | Cash and cash equivalents and restricted cash    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (3,336) (13,885)
CAD | Trade and other receivables    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (3,716) (3,454)
CAD | Accounts payable and accrued liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (10,615) (18,508)
CAD | Other long-term liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (231) (287)
CAD | Lease liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (11,805) (13,400)
CAD | Net financial position exposure    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure 15,599 14,856
EUR    
Disclosure of detailed information about financial instruments [line items]    
Impact of 1% Strengthening in the closing exchange rate on loss before tax (58) (1,092)
EUR | Cash and cash equivalents and restricted cash    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (5,828) (6,270)
EUR | Trade and other receivables    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (9,004) (4,086)
EUR | Accounts payable and accrued liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (8,948) (5,755)
EUR | Other long-term liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (267) (270)
EUR | Lease liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (3,258) (4,447)
EUR | Net financial position exposure    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (2,359) 116
AUD    
Disclosure of detailed information about financial instruments [line items]    
Impact of 1% Strengthening in the closing exchange rate on loss before tax 161 (512)
AUD | Cash and cash equivalents and restricted cash    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (2,078) (2,522)
AUD | Trade and other receivables    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (8,199) (2,675)
AUD | Accounts payable and accrued liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (3,604) (2,834)
AUD | Other long-term liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (68) (53)
AUD | Lease liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (1,870) (477)
AUD | Net financial position exposure    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (4,735) (1,833)
GBP    
Disclosure of detailed information about financial instruments [line items]    
Impact of 1% Strengthening in the closing exchange rate on loss before tax 111 (383)
GBP | Cash and cash equivalents and restricted cash    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (1,907) (1,338)
GBP | Trade and other receivables    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (1,680) (1,472)
GBP | Accounts payable and accrued liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (1,561) (1,466)
GBP | Other long-term liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (119) (142)
GBP | Lease liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (4,085) (4,315)
GBP | Net financial position exposure    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure 2,178 3,113
CHF | Cash and cash equivalents and restricted cash    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (1,456) (2,333)
CHF | Trade and other receivables    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (1,074) (628)
CHF | Accounts payable and accrued liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (1,294) (1,366)
CHF | Other long-term liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (48) (37)
CHF | Lease liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (866) (259)
CHF | Net financial position exposure    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (322) (1,299)
NZD    
Disclosure of detailed information about financial instruments [line items]    
Impact of 1% Strengthening in the closing exchange rate on loss before tax (152) (167)
Other    
Disclosure of detailed information about financial instruments [line items]    
Impact of 1% Strengthening in the closing exchange rate on loss before tax 15 (166)
Other | Cash and cash equivalents and restricted cash    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (1,537) (4,103)
Other | Trade and other receivables    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (1,883) (483)
Other | Accounts payable and accrued liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (3,333) (3,172)
Other | Other long-term liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (5) 0
Other | Lease liabilities    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure (211) (548)
Other | Net financial position exposure    
Disclosure of detailed information about financial instruments [line items]    
Net financial position exposure $ 129 $ (866)