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Stock-Based Awards - Tax Benefit Recognized (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Jan. 24, 2015 | Jan. 25, 2014 | Jan. 24, 2015 | Jan. 25, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |  |
Stock-based compensation | $ 3,664 us-gaap_ShareBasedCompensation | $ 3,544 us-gaap_ShareBasedCompensation | $ 7,554 us-gaap_ShareBasedCompensation | $ 7,049 us-gaap_ShareBasedCompensation
Tax benefit recognized in the statement of operations | $ 1,508 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | $ 1,368 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | $ 2,973 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | $ 2,665 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense

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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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