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Intangible assets - Schedule of Intangible Assets (Details) - USD ($)
$ in Thousands
6 Months Ended
Sep. 30, 2021
Mar. 31, 2021
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying amount $ 40,600 $ 38,420
Accumulated amortization (21,751) (20,117)
Net 18,849 18,303
Patents and trademarks    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying amount 113 115
Accumulated amortization (84) (82)
Net $ 29 33
Patents and trademarks | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Useful life (in years) 3 years  
Patents and trademarks | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Useful life (in years) 20 years  
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying amount $ 2,653 2,687
Accumulated amortization (2,330) (2,271)
Net $ 323 416
Customer relationships | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Useful life (in years) 2 years  
Customer relationships | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Useful life (in years) 15 years  
Internal-use software, technology and other    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying amount $ 37,834 35,618
Accumulated amortization (19,337) (17,764)
Net $ 18,497 $ 17,854
Internal-use software, technology and other | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Useful life (in years) 1 year  
Internal-use software, technology and other | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Useful life (in years) 18 years