Litigation - Additional Information (Detail)	3 Months Ended
	Nov. 23, 2013
Commitments And Contingencies Disclosure [Abstract]
Site contingency, recovery from third party of environmental remediation cost	In 2004, the Company acquired a store site in Mount Ephraim, New Jersey that had previously been the site of a gasoline service station and contained evidence of groundwater contamination. Upon acquisition, the Company voluntarily reported the groundwater contamination issue to the New Jersey Department of Environmental Protection and entered into a Voluntary Remediation Agreement providing for the remediation of the contamination associated with the property. The Company has conducted and paid for (at an immaterial cost to the Company) remediation of contamination on the property. The Company is also investigating, and will be addressing, potential vapor intrusion impacts in downgradient residences and businesses. The New Jersey Department of Environmental Protection has asserted, in a Directive and Notice to Insurers dated February 19, 2013 (“Directive”), that the Company is liable for the downgradient impacts under a joint and severable liability theory, and the Company has contested any such assertions due to the existence of other entities/sources of contamination, some of which are named in the Directive, in the area of the property. On December 13, 2013, the New Jersey Department of Environmental Protection communicated to the Company that it intends to issue an Amended Directive asserting the Company’s liability, and the Company will continue to contest the assertions of liability. Pursuant to the Voluntary Remediation Agreement, upon completion of all remediation required by the agreement, the Company believes it should be eligible to be reimbursed up to 75 percent of qualified remediation costs by the State of New Jersey. The Company has asked the state for clarification that the agreement applies to off-site work, and the state is considering the request. Although the aggregate amount of additional costs that the Company may incur pursuant to the remediation cannot currently be ascertained, the Company does not currently believe that fulfillment of its obligations under the agreement or otherwise will result in costs that are material to its financial condition, results of operations or cash flow.
Reimbursable remediation costs	75.00%