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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, 2022 $ / shares shares
Number of Shares
Outstanding, Beginning balance (in shares) | shares	106
Distributions (in shares) | shares	(7)
Outstanding, Ending balance (in shares) | shares	99
Weighted-Average Grant Date Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 68.11
Distributions (in dollars per share) | $ / shares	48.01
Ending balance (in dollars per share) | $ / shares	$ 70.81

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- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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