Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jan. 30, 2015	Jul. 31, 2015	Aug. 01, 2014	Oct. 31, 2014	Mar. 05, 2014	Jul. 26, 2013
Commitments And Contingencies Disclosure [Abstract]
Environmental Exit Costs, Assets Previously Disposed, Liability for Remediation		$ 1,500		$ 1,500
Gain on release of non-income tax liability	$ 15,700	$ 15,656	$ 0
Reduction in interest expense	$ 2,400
Consent agreement term		The Consent Agreement has a three-year term and provides for: (i) a payment of $20 million, $10 million of which is suspended and eligible for offset credit based on verified expenditures for past and future remedial compliance measures; (ii) the appointment of an external Special Compliance Official to oversee compliance with the Consent Agreement and the ITAR; (iii) two external audits of the Company’s ITAR compliance program; and (iv) continued
Total penalty proposed by DDTC Office of Compliance					$ 20,000	$ 10,000
Penalty suspended and eligible for offset credit					$ 10,000
Paid and Recorded in March 2014						4,000
Paid and Recorded in February 2015						2,000
Estimated and to be paid in March 2016						2,000
Estimated and to be paid March 2017						$ 2,000