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Stock-Based Compensation - Summarized Activity Related to Director Deferred Compensation Shares (Detail) - Directors [Member] - Deferred Compensation Share Equivalent Units [Member] shares in Thousands	6 Months Ended
	Apr. 30, 2016 $ / shares shares
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Number of Shares, Outstanding, Beginning balance \| shares	100
Number of Shares, Deferrals \| shares	1
Number of Shares, Dividend equivalents \| shares	1
Number of Shares, Distributions \| shares	(6)
Number of Shares, Outstanding, Ending balance \| shares	96
Weighted-Average Grant Date Fair Value, Beginning balance \| $ / shares	$ 36.76
Weighted-Average Grant Date Fair Value, Deferrals \| $ / shares	67.61
Weighted-Average Grant Date Fair Value, Dividend equivalents \| $ / shares	67.53
Weighted-Average Grant Date Fair Value, Distributions \| $ / shares	26.16
Weighted-Average Grant Date Fair Value, Ending balance \| $ / shares	$ 37.73