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Financial instruments - Allowance for Expected Credit Losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Changes in allowance account for credit losses of financial assets [abstract]    
Balance – Beginning of fiscal year $ 3,519 $ 2,878
Increase 1,603 2,777
Write-offs (2,079) (2,136)
Balance – End of fiscal year $ 3,043 $ 3,519
Not past due    
Disclosure of detailed information about financial instruments [line items]    
Expected loss rate 3.00% 3.00%
Not past due | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount $ (17,279) $ (9,328)
Not past due | Loss allowance    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount $ 518 $ 280
0–30    
Disclosure of detailed information about financial instruments [line items]    
Expected loss rate 14.00% 14.00%
0–30 | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount $ (2,212) $ (1,087)
0–30 | Loss allowance    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount $ 310 $ 152
30–60    
Disclosure of detailed information about financial instruments [line items]    
Expected loss rate 46.00% 41.00%
30–60 | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount $ (617) $ (917)
30–60 | Loss allowance    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount $ 284 $ 376
60–90    
Disclosure of detailed information about financial instruments [line items]    
Expected loss rate 64.00% 55.00%
60–90 | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount $ (213) $ (231)
60–90 | Loss allowance    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount $ 136 $ 127
90–180    
Disclosure of detailed information about financial instruments [line items]    
Expected loss rate 68.00% 63.00%
90–180 | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount $ (577) $ (1,156)
90–180 | Loss allowance    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount $ 392 $ 728
180+    
Disclosure of detailed information about financial instruments [line items]    
Expected loss rate 70.00% 67.00%
180+ | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount $ (1,996) $ (2,758)
180+ | Loss allowance    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount $ 1,403 $ 1,856