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Stock option plan - Restricted Stock Units Activity (Detail) - Unvested restricted stock units - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Number of Shares    
Number of shares, Outstanding Beginning Balance 569  
Number of shares, granted 436  
Number of shares, vested (237)  
Number of shares, forfeited (61)  
Number of shares, Outstanding Ending Balance 707 569
Expected to vest, Outstanding 707  
Weighted average grant date fair value per share    
Weighted average grant date fair value price per share, Outstanding Beginning Balance $ 32.96  
Weighted average grant date fair value price per share, granted 113.06  
Weighted average grant date fair value price per share, vested 44.36  
Weighted average grant date fair value price per share, forfeited 86.60  
Weighted average grant date fair value price per share, Outstanding Ending Balance 73.86 $ 32.96
Weighted average grant date fair value price per share, Expected to vest $ 73.86  
Weighted average remaining contractual term (years)    
Weighted average remaining contractual term, Outstanding 2 years 8 months 12 days 3 years 2 months 12 days
Weighted average remaining contractual term, Expected to vest 2 years 8 months 12 days  
Aggregate Intrinsic Value    
Aggregate intrinsic value, Outstanding $ 75,629 $ 43,260
Aggregate intrinsic value, Expected to vest $ 75,629