Pension and Savings Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
May 09, 2015
Compensation and Retirement Disclosure [Abstract]
Annual contributions by the Company to pension plans	$ 3.9
Expected contributions to the plans by the Company in fiscal 2015	$ 13.0

The increase in the fair value of plan assets from contributions made by the employer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)(3)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

Name:	us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration