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Financial instruments - Allowance for Expected Credit Losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Loss allowance    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount $ (5,056) $ (4,131)
Changes in allowance account for credit losses of financial assets [abstract]    
Financial assets 4,131 3,043
Increase 4,015 3,076
Write-offs (3,090) (1,988)
Financial assets $ 5,056 $ 4,131
Not past due and limited risk    
Disclosure of detailed information about financial instruments [line items]    
Expected loss rate 3.00% 3.00%
Not past due and limited risk | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount $ 38,665 $ 28,209
Changes in allowance account for credit losses of financial assets [abstract]    
Financial assets (28,209)  
Financial assets (38,665) (28,209)
Not past due and limited risk | Loss allowance    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount (1,172) (741)
Changes in allowance account for credit losses of financial assets [abstract]    
Financial assets 741  
Financial assets $ 1,172 $ 741
0–30    
Disclosure of detailed information about financial instruments [line items]    
Expected loss rate 12.00% 15.00%
0–30 | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount $ 3,390 $ 4,649
Changes in allowance account for credit losses of financial assets [abstract]    
Financial assets (4,649)  
Financial assets (3,390) (4,649)
0–30 | Loss allowance    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount (407) (697)
Changes in allowance account for credit losses of financial assets [abstract]    
Financial assets 697  
Financial assets $ 407 $ 697
30–60    
Disclosure of detailed information about financial instruments [line items]    
Expected loss rate 31.00% 48.00%
30–60 | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount $ 1,314 $ 1,418
Changes in allowance account for credit losses of financial assets [abstract]    
Financial assets (1,418)  
Financial assets (1,314) (1,418)
30–60 | Loss allowance    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount (407) (681)
Changes in allowance account for credit losses of financial assets [abstract]    
Financial assets 681  
Financial assets $ 407 $ 681
60–90    
Disclosure of detailed information about financial instruments [line items]    
Expected loss rate 48.00% 67.00%
60–90 | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount $ 626 $ 521
Changes in allowance account for credit losses of financial assets [abstract]    
Financial assets (521)  
Financial assets (626) (521)
60–90 | Loss allowance    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount (300) (349)
Changes in allowance account for credit losses of financial assets [abstract]    
Financial assets 349  
Financial assets $ 300 $ 349
90–180    
Disclosure of detailed information about financial instruments [line items]    
Expected loss rate 63.00% 69.00%
90–180 | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount $ 1,407 $ 989
Changes in allowance account for credit losses of financial assets [abstract]    
Financial assets (989)  
Financial assets (1,407) (989)
90–180 | Loss allowance    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount (886) (682)
Changes in allowance account for credit losses of financial assets [abstract]    
Financial assets 682  
Financial assets $ 886 $ 682
180+    
Disclosure of detailed information about financial instruments [line items]    
Expected loss rate 69.00% 71.00%
180+ | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount $ 2,730 $ 1,381
Changes in allowance account for credit losses of financial assets [abstract]    
Financial assets (1,381)  
Financial assets (2,730) (1,381)
180+ | Loss allowance    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount (1,884) (981)
Changes in allowance account for credit losses of financial assets [abstract]    
Financial assets 981  
Financial assets $ 1,884 $ 981