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Financial instruments - Allowance for Expected Credit Losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Changes in allowance account for credit losses of financial assets [abstract]    
Balance – Beginning of fiscal year $ 3,043 $ 3,519
Increase 3,076 1,603
Reversal, allowance account for credit losses of financial assets 1,988 2,079
Balance – End of fiscal year $ 4,131 $ 3,043
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 $ (28,209) $ (17,279)
Not past due | Loss allowance    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount $ 741 $ 518
0–30    
Disclosure of detailed information about financial instruments [line items]    
Expected loss rate 15.00% 14.00%
0–30 | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount $ (4,649) $ (2,212)
0–30 | Loss allowance    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount $ 697 $ 310
30–60    
Disclosure of detailed information about financial instruments [line items]    
Expected loss rate 48.00% 46.00%
30–60 | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount $ (1,418) $ (617)
30–60 | Loss allowance    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount $ 681 $ 284
60–90    
Disclosure of detailed information about financial instruments [line items]    
Expected loss rate 67.00% 64.00%
60–90 | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount $ (521) $ (213)
60–90 | Loss allowance    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount $ 349 $ 136
90–180    
Disclosure of detailed information about financial instruments [line items]    
Expected loss rate 69.00% 68.00%
90–180 | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount $ (989) $ (577)
90–180 | Loss allowance    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount $ 682 $ 392
180+    
Disclosure of detailed information about financial instruments [line items]    
Expected loss rate 71.00% 70.00%
180+ | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount $ (1,381) $ (1,996)
180+ | Loss allowance    
Disclosure of detailed information about financial instruments [line items]    
Financial assets, carrying amount $ 981 $ 1,403