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Stock-based compensation - Restricted Stock Units Activity (Detail) - Unvested restricted stock units - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Number of Shares    
Number of shares, Outstanding Beginning Balance 707  
Number of shares, granted 995  
Number of shares, vested (62,000)  
Number of shares, forfeited (35)  
Number of shares, Outstanding Ending Balance 1,605 707
Expected to vest, Outstanding 1,605  
Weighted average grant date fair value per share    
Weighted average grant date fair value price per share, Outstanding Beginning Balance $ 73.86  
Weighted average grant date fair value price per share, granted 82.50  
Weighted average grant date fair value price per share, vested 64.90  
Weighted average grant date fair value price per share, forfeited 60.95  
Weighted average grant date fair value price per share, Outstanding Ending Balance 79.85 $ 73.86
Weighted average grant date fair value price per share, Expected to vest $ 79.85  
Weighted average remaining contractual term (years)    
Weighted average remaining contractual term, Outstanding 3 years 18 days 2 years 8 months 12 days
Weighted average remaining contractual term, Expected to vest 3 years 18 days  
Aggregate Intrinsic Value    
Aggregate intrinsic value, Outstanding $ 124,238 $ 75,629
Aggregate intrinsic value, Expected to vest $ 124,238