Acquisitions and Dispositions (Sale of AGI In-Store) - Additional Information (Detail) - AGI In-Store [Member] - USD ($) $ in Thousands		1 Months Ended	3 Months Ended			6 Months Ended
	Aug. 29, 2014	Mar. 31, 2015	Feb. 28, 2015	Nov. 28, 2014	Aug. 29, 2014	Aug. 29, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of AGI In-Store	$ 73,700
Net gain on sale of AGI In-Store	$ 38,800				$ 38,803	$ 38,803
Payment for working capital adjustments		$ 3,200
Post-closing date adjustments including final working capital adjustment			$ 3,700	$ 100