Liabilities and Restructuring Charges - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Restructuring Charges [Abstract]
Restructuring charges	$ (248)	$ 0	$ 15,088	$ 0
Voluntary Retirement Program and Headcount Reduction Program
Restructuring Charges [Abstract]
Restructuring charges			15,100
Restructuring charges paid during period	800		15,100
Payroll and related benefits liabilities	$ 0		$ 0