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Capital Stock (Details) - USD ($) |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Feb. 23, 2016 | Sep. 15, 2015 | Aug. 25, 2015 | Jan. 23, 2016 | Jan. 23, 2016 | Jan. 24, 2015 | Jul. 25, 2015 | Jul. 26, 2014
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares repurchased |  | 805,000 |  | 954,224 |  |  | 1,669,924 |
Total Consideration (Dollars in thousands) |  |  |  | $ 69,997,000 | $ 69,997,000 | $ 17,147,000 | $ 87,146,000 |
Average Price Per Share (in dollars per share) |  | $ 74.53 |  | $ 73.35 |  |  | $ 52.19 |
Stock repurchased and retired during period, value |  | $ 60,000,000 |  |  |  |  |  |
Share repurchase program, additional amount authorized for repurchase |  |  | $ 50,000,000.0 |  |  |  |  |
Remaining authorized repurchase amount |  |  |  | $ 50,000,000 | $ 50,000,000 |  |  |
Stock repurchase program, period in force |  |  | 18 months |  |  |  |  |
Stock repurchase program, authorized amount |  |  | $ 50,000,000 |  |  |  |  |
Shares paid for tax withholding for share based compensation |  |  |  |  |  |  | 156,362 | 138,535
Value of shares paid for tax withholding for share based compensation |  |  |  |  |  |  | $ 12,100,000 | $ 4,300,000
Subsequent Event [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Share repurchase program, additional amount authorized for repurchase | $ 50,000,000 |  |  |  |  |  |  |
Remaining authorized repurchase amount | $ 100,000,000 |  |  |  |  |  |  |
Stock repurchase program, period in force extension | 6 months |  |  |  |  |  |  |
Stock repurchase program, authorized amount | $ 100,000,000 |  |  |  |  |  |  |

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- Definition The total costs of shares repurchased during the period divided by the total number of shares that have been repurchased during the period which have not been retired and are not held in treasury. + References No definition available. + Details
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- Definition Share Repurchase Program, Additional Amount Authorized for Repurchase + References No definition available. + Details
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- Definition Stock Repurchase Program, Period in Force Extension + References No definition available. + Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the monetary value of shares the employees use to repay the employer. + References No definition available. + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 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 + Details
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