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Rollforward of Liabilities Recognized in Consolidated Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2015
Restructuring Cost and Reserve [Line Items]
Accrued liability as of February 1, 2014	$ 0us-gaap_RestructuringReserve
Add: Costs incurred, excluding non-cash charges	17,752us-gaap_RestructuringCharges
Less: Cash payments	(5,296)us-gaap_PaymentsForRestructuring
Accrued liability as of January 31, 2015	$ 12,456us-gaap_RestructuringReserve

- 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.

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