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Income taxes - Deferred Tax Assets (Liabilities) Continuity (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Disclosure of deferred tax [Line Items]    
Balance at the beginning of the period $ 301 $ (6,679)
Deferred 323 6,688
Charged (credited) to other comprehensive loss (68) 0
Other (4) 292
Balance at the end of the period 552 301
Property and equipment    
Disclosure of deferred tax [Line Items]    
Balance at the beginning of the period 2,617 2,103
Deferred 896 514
Charged (credited) to other comprehensive loss 0 0
Other 0 0
Balance at the end of the period 3,513 2,617
Intangible assets    
Disclosure of deferred tax [Line Items]    
Balance at the beginning of the period (67,972) (97,647)
Deferred 21,275 29,675
Charged (credited) to other comprehensive loss 0 0
Other 0 0
Balance at the end of the period (46,697) (67,972)
Lease liabilities    
Disclosure of deferred tax [Line Items]    
Balance at the beginning of the period 6,045 6,354
Deferred (388) (309)
Charged (credited) to other comprehensive loss 0 0
Other 0 0
Balance at the end of the period 5,657 6,045
Lease right-of-use assets    
Disclosure of deferred tax [Line Items]    
Balance at the beginning of the period (5,028) (5,140)
Deferred 815 112
Charged (credited) to other comprehensive loss 0 0
Other 0 0
Balance at the end of the period (4,213) (5,028)
Non-capital losses carried forward    
Disclosure of deferred tax [Line Items]    
Balance at the beginning of the period 49,467 78,292
Deferred (24,726) (28,825)
Charged (credited) to other comprehensive loss 0 0
Other 0 0
Balance at the end of the period 24,741 49,467
Deferred revenue    
Disclosure of deferred tax [Line Items]    
Balance at the beginning of the period 530 1,217
Deferred (109) (687)
Charged (credited) to other comprehensive loss 0 0
Other 0 0
Balance at the end of the period 421 530
Interest expenses carried forward    
Disclosure of deferred tax [Line Items]    
Balance at the beginning of the period 3,170 5,852
Deferred (3,170) (2,682)
Charged (credited) to other comprehensive loss 0 0
Other 0 0
Balance at the end of the period 0 3,170
Long-term incentive plan    
Disclosure of deferred tax [Line Items]    
Balance at the beginning of the period 6,211 4,702
Deferred 2,633 1,509
Charged (credited) to other comprehensive loss 0 0
Other 0 0
Balance at the end of the period 8,844 6,211
Capitalized R&D costs    
Disclosure of deferred tax [Line Items]    
Balance at the beginning of the period 7,542 0
Deferred 4,993 7,542
Charged (credited) to other comprehensive loss 0 0
Other 0 0
Balance at the end of the period 12,535 7,542
Other    
Disclosure of deferred tax [Line Items]    
Balance at the beginning of the period (2,281) (2,412)
Deferred (1,896) (161)
Charged (credited) to other comprehensive loss (68) 0
Other (4) 292
Balance at the end of the period $ (4,249) $ (2,281)