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Liabilities and Restructuring Charges - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014	Jan. 31, 2015
Restructuring Charges [Abstract]
Restructuring charges	$ 0us-gaap_RestructuringCharges	$ 0us-gaap_RestructuringCharges	$ 15,336,000us-gaap_RestructuringCharges	$ 0us-gaap_RestructuringCharges
Voluntary Retirement Program and Headcount Reduction Program [Member]
Restructuring Charges [Abstract]
Restructuring charges					15,300,000
Restructuring charges paid during period	1,700,000		14,300,000
Payroll and related benefits liabilities	$ 1,000,000		$ 1,000,000

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References+ Details