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Stock-based compensation - Summarized Activity Related to Restricted Stock Units (Detail) - Restricted Stock Unit
shares in Thousands
 9 Months Ended
Jul. 31, 2022
$ / shares
shares
Number of Shares  
Beginning balance (in shares) | shares 67
Granted (in shares) | shares 41
Forfeited (in shares) | shares (9)
Vested (in shares) | shares (15)
Ending balance (in shares) | shares 84
Weighted-Average Grant Date Fair Value  
Beginning balance (in dollars per share) | $ / shares $ 202,810
Granted (in dollars per share) | $ / shares 263.53
Forfeited (in dollars per share) | $ / shares 223.93
Vested (in dollars per share) | $ / shares 201.79
Ending balance (in dollars per share) | $ / shares $ 230.18