Share Repurchases (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Aug. 01, 2014	Aug. 02, 2013	Aug. 03, 2012
Share Repurchases [Abstract]
Maximum aggregate purchase price	$ 50,000	$ 100,000	$ 65,000
Cost of shares repurchased	$ 12,473	$ 3,570	$ 14,923
Shares of common stock repurchased (in shares)	120,000	44,300	265,538

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30, 31

-Article 5

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