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Income taxes - Deferred Tax Assets (Liabilities) Continuity (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disclosure of deferred tax [Line Items]    
Balance at the beginning of the period $ 6,679 $ 1,186
Business acquisitions and other   (33,517)
Balance at the end of the period (301) 6,679
Deferred (6,688) (28,024)
Increase Decrease Through Business Combinations And Other Movement, Deferred Tax Liability (Asset) 292  
Property and equipment    
Disclosure of deferred tax [Line Items]    
Balance at the beginning of the period 2,103 2,061
Business acquisitions and other   (33)
Balance at the end of the period 2,617 2,103
Deferred (514) (75)
Increase Decrease Through Business Combinations And Other Movement, Deferred Tax Liability (Asset) 0  
Intangible assets    
Disclosure of deferred tax [Line Items]    
Balance at the beginning of the period (97,647) (50,476)
Business acquisitions and other   (69,213)
Balance at the end of the period (67,972) (97,647)
Deferred (29,675) (22,042)
Increase Decrease Through Business Combinations And Other Movement, Deferred Tax Liability (Asset) 0  
Lease liabilities    
Disclosure of deferred tax [Line Items]    
Balance at the beginning of the period 6,354 6,073
Business acquisitions and other   276
Balance at the end of the period 6,045 6,354
Deferred 309 (5)
Increase Decrease Through Business Combinations And Other Movement, Deferred Tax Liability (Asset) 0  
Lease right-of-use assets    
Disclosure of deferred tax [Line Items]    
Balance at the beginning of the period (5,140) (5,000)
Business acquisitions and other   (226)
Balance at the end of the period (5,028) (5,140)
Deferred (112) (86)
Increase Decrease Through Business Combinations And Other Movement, Deferred Tax Liability (Asset) 0  
Non-capital losses carried forward    
Disclosure of deferred tax [Line Items]    
Balance at the beginning of the period 78,292 41,308
Business acquisitions and other   33,545
Balance at the end of the period 49,467 78,292
Deferred 28,825 (3,439)
Increase Decrease Through Business Combinations And Other Movement, Deferred Tax Liability (Asset) 0  
Deferred revenue    
Disclosure of deferred tax [Line Items]    
Balance at the beginning of the period 1,217 1,011
Business acquisitions and other   0
Balance at the end of the period 530 1,217
Deferred 687 (206)
Increase Decrease Through Business Combinations And Other Movement, Deferred Tax Liability (Asset) 0  
Interest expenses carried forward    
Disclosure of deferred tax [Line Items]    
Balance at the beginning of the period 5,852 5,188
Business acquisitions and other   0
Balance at the end of the period 3,170 5,852
Deferred 2,682 (664)
Increase Decrease Through Business Combinations And Other Movement, Deferred Tax Liability (Asset) 0  
Other    
Disclosure of deferred tax [Line Items]    
Balance at the beginning of the period 2,290 (1,351)
Business acquisitions and other   2,134
Balance at the end of the period 11,472 2,290
Deferred (8,890) $ (1,507)
Increase Decrease Through Business Combinations And Other Movement, Deferred Tax Liability (Asset) $ 292