Credit Facility - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified			1 Months Ended
	Aug. 02, 2014	Jul. 27, 2013	Apr. 29, 2011 Amended Credit Agreement
Line of Credit Facility [Line Items]
Credit facility, borrowing capacity			$ 1,000,000
Credit facility maturity term, in years			5 years
Option to increase in commitments under credit agreement, maximum			300,000
Credit facility, expiration date			Apr. 29, 2016
Percentage of Loan Cap under Amended Credit Agreement			10.00%
Amount of Loan Cap under Amended Credit Agreement			50,000
Line of credit facility, amount outstanding	0	7,500
Letters of credit, outstanding amount	$ 62,782	$ 33,904