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Restructuring Charges - Activity and Liability Balances (Detail) (Restructuring Plan 2013 and 2011 [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Apr. 30, 2013	Oct. 31, 2012	Oct. 31, 2011
Restructuring Reserve Disclosures [Abstract]
Beginning Balance	$ 12,191	$ 7,308
Charged to expense	5,362	13,602	8,038
Cash payments	(9,051)	(8,719)	(730)
Adjustments to accrual	(553)
Ending Balance	7,949	12,191	7,308
Workforce [Member]
Restructuring Reserve Disclosures [Abstract]
Beginning Balance	5,335	1,076
Charged to expense	3,744	9,721	1,389
Cash payments	(6,266)	(5,462)	(313)
Ending Balance	2,813	5,335	1,076
Facility & Other [Member]
Restructuring Reserve Disclosures [Abstract]
Beginning Balance	6,856	6,232
Charged to expense	1,618	3,881	6,649
Cash payments	(2,785)	(3,257)	(417)
Adjustments to accrual	(553)
Ending Balance	$ 5,136	$ 6,856	$ 6,232

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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- Definition

Amount of any reversal and other adjustment made during the period to the amount of a previously accrued liability for a specified type of restructuring cost, excluding adjustments for costs incurred during the period, costs settled during the period, and foreign currency translation adjustments.

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- Definition

Amount of cash paid in the period to fully or partially settle a specified, previously accrued type of restructuring cost.

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