Stock-based compensation - Summarized Activity Related to Director Deferred Compensation Shares (Detail) - Directors - Deferred Compensation Share Equivalent Units - $ / shares shares in Thousands	3 Months Ended	9 Months Ended
	Jul. 31, 2022	Jul. 31, 2022
Number of Shares
Outstanding, Beginning balance (in shares)		106
Dividend equivalents (in shares)	1
Distributions (in shares)		(16)
Outstanding, Ending balance (in shares)	91	91
Weighted-Average Grant Date Fair Value
Beginning balance (in dollars per share)		$ 68.11
Dividend equivalents (in dollars per share)	$ 228.45
Distributions (in dollars per share)		72.83
Ending balance (in dollars per share)	$ 69.00	$ 69.00