Debt Issuance - Additional Information (Detail) - USD ($)		3 Months Ended
	Aug. 28, 2015	Oct. 31, 2015	Aug. 01, 2015	Jun. 16, 2015	Apr. 25, 2015
Line of Credit Facility [Line Items]
Credit facility, borrowed amount		$ 0			$ 0
Borrowings on revolving credit		80,000,000
Credit Agreement [Member]
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity			$ 1,500,000,000
Credit facility, expiration date			Jun. 16, 2020
LIBOR [Member] | Credit Agreement [Member]
Line of Credit Facility [Line Items]
Credit facility, basis spread rate			2.00%
LIBOR [Member] | Minimum [Member] | Credit Agreement [Member]
Line of Credit Facility [Line Items]
Credit facility, basis spread rate			1.125%
LIBOR [Member] | Maximum [Member] | Credit Agreement [Member]
Line of Credit Facility [Line Items]
Credit facility, basis spread rate			2.00%
Unsecured Term Loan [Member] | Credit Agreement [Member]
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity		325,875,000	$ 1,000,000,000
Credit facility, borrowed amount			1,000,000,000
Credit facility, amount repaid	$ 670,000,000
Debt issuance cost amortization	$ 5,153,000
Principal payment		$ 4,125,000
Unsecured Revolving Line of Credit [Member] | Credit Agreement [Member]
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity			500,000,000
Credit facility, borrowed amount			$ 200,000,000
Credit Facility Expiring on December 2016 [Member]
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity				$ 300,000,000