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Accounts Receivable Accounts Receivable - Parenthetical (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 25, 2014 | Jan. 26, 2013 | Jan. 25, 2014 | Jan. 26, 2013
Receivables [Abstract] |  |  |  |
Allowance for Doubtful Accounts Receivable, Write-offs | $ 0 | $ 0 | $ 0 | $ 0

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- Definition Amount of direct write-downs of accounts receivable charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Balance Type: | na
Period Type: | duration