Restructuring Charges - Activity and Liability Balances (Detail) (Restructuring Plan Two Thousand Thirteen and Two Thousand Eleven [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Apr. 30, 2014	Oct. 31, 2013
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 19,098	$ 12,191
Charged to expense	10,713	28,509
Cash payments	(14,984)	(21,010)
Adjustments		(592)
Ending Balance	14,827	19,098
Workforce [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	12,159	5,335
Charged to expense	5,593	22,671
Cash payments	(12,123)	(15,847)
Adjustments		0
Ending Balance	5,629	12,159
Facility & Other [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	6,939	6,856
Charged to expense	5,120	5,838
Cash payments	(2,861)	(5,163)
Adjustments		(592)
Ending Balance	$ 9,198	$ 6,939