Credit Facility - Additional Information (Detail) - USD ($)			3 Months Ended
	Aug. 03, 2015	Apr. 29, 2011	Oct. 31, 2015	Aug. 01, 2015	Nov. 01, 2014
Line of Credit Facility [Line Items]
Line of credit facility, amount outstanding			$ 192,000,000		$ 64,000,000
Letters of credit, outstanding amount			48,318,000		$ 66,859,000
Amended Credit Agreement
Line of Credit Facility [Line Items]
Credit facility, borrowing capacity		$ 1,000,000,000
Credit facility maturity term, in years		5 years
Credit facility, expiration date				Apr. 29, 2016
Write off of deferred financing fees			460,000
New Credit Facility
Line of Credit Facility [Line Items]
Credit facility, borrowing capacity	$ 700,000,000
Credit facility maturity term, in years	5 years
Unamortized deferred financing fees			$ 3,542,000
Amortization period for deferred financing fees			5 years
Collateral fees			$ 5,701,000
Amortization period for deferred financing fees			5 years
New Credit Facility | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Debt instrument, percentage points added to reference rate	1.75%
New Credit Facility | Base Rate
Line of Credit Facility [Line Items]
Debt instrument, percentage points added to reference rate	0.75%
New Credit Facility | Maximum
Line of Credit Facility [Line Items]
Option to increase in commitments under credit agreement	$ 250,000,000
New Credit Facility | Maximum | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Debt instrument, percentage points added to reference rate	2.00%
New Credit Facility | Maximum | Base Rate
Line of Credit Facility [Line Items]
Debt instrument, percentage points added to reference rate	1.00%
New Credit Facility | Minimum | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Debt instrument, percentage points added to reference rate	1.50%
New Credit Facility | Minimum | Base Rate
Line of Credit Facility [Line Items]
Debt instrument, percentage points added to reference rate	0.50%