Stock-based compensation - Summarized Activity Related to Restricted Stock Units (Detail) - Restricted Stock Unit shares in Thousands	6 Months Ended
	Apr. 30, 2023 $ / shares shares
Number of Shares
Beginning balance (in shares) | shares	81
Granted (in shares) | shares	36
Forfeited (in shares) | shares	(4)
Vested (in shares) | shares	(44)
Ending balance (in shares) | shares	69
Weighted-Average Grant Date Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 223,770
Granted (in dollars per share) | $ / shares	237.32
Forfeited (in dollars per share) | $ / shares	242.31
Vested (in dollars per share) | $ / shares	219.20
Ending balance (in dollars per share) | $ / shares	$ 232.97