Stock-based compensation - Summarized Activity Related to Director Deferred Compensation Shares (Detail) - Directors - Deferred Compensation Share Equivalent Units shares in Thousands	6 Months Ended
	Apr. 30, 2024 $ / shares shares
Number of Shares
Outstanding, Beginning balance (in shares) | shares	78
Distributions (in shares) | shares	(9)
Outstanding, Ending balance (in shares) | shares	69
Weighted-Average Grant Date  Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 93.11
Distributions (in dollars per share) | $ / shares	53.86
Ending balance (in dollars per share) | $ / shares	$ 99.66