Commitments and Contingencies - Additional Information (Detail) (Guarantee obligations [Member], USD $) In Millions, unless otherwise specified	Aug. 02, 2014	Aug. 03, 2013
Guarantee obligations [Member]
Loss Contingencies [Line Items]
Guarantees in the form of commercial letters of credit	$ 11	$ 10

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

No definition available.

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant