Stock-based compensation - Summarized Activity Related to Director Deferred Compensation Shares (Detail) - Directors - Deferred Compensation Share Equivalent Units shares in Thousands	3 Months Ended
	Jan. 31, 2023 $ / shares shares
Number of Shares
Outstanding, Beginning balance (in shares) | shares	90
Distributions (in shares) | shares	(4)
Outstanding, Ending balance (in shares) | shares	86
Weighted-Average Grant Date Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 77.70
Distributions (in dollars per share) | $ / shares	50.88
Ending balance (in dollars per share) | $ / shares	$ 79.73