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Goodwill and intangible assets - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization of intangible assets $ 2,000,000 $ 2,000,000 $ 4,100,000 $ 4,100,000
Goodwill and intangible asset impairment $ 0 $ 0 $ 0 $ 0