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Stock-based compensation - Summary of PSU Activity (Details) - Performance Stock Unit - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended 12 Months Ended
Mar. 31, 2022
Sep. 30, 2021
Number of shares    
Beginning balance (in shares) 10  
Equity awards restricted shares 342  
Forfeited (in shares) (1)  
Ending balance (in shares) 351 10
Expected to vest (in shares) 351  
Weighted average grant date fair value per share    
Beginning balance (in usd per share) $ 3.59  
Granted (in usd per share) 80.31  
Forfeited (in usd per share) 3.34  
Ending balance (in usd per share) 81.21 $ 3.59
Expected to vest (in usd per share) $ 81.21  
Weighted average remaining contractual term (years)    
Weighted average remaining contractual term, Outstanding 2 years 1 month 6 days 2 years 3 months 18 days
Weighted average remaining contractual term, Expected to vest 2 years 1 month 6 days  
Aggregate Intrinsic Value    
Aggregate intrinsic value, Outstanding $ 17,328 $ 1,016
Aggregate intrinsic value, Expected to vest $ 17,328