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Stockholders' Equity (Details) - USD ($) | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2016 | Apr. 30, 2015 | Jun. 08, 2016 | Mar. 10, 2016 | Dec. 09, 2015 | Sep. 28, 2015
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract] |  |  |  |  |  |
Stock repurchase program, remaining authorized repurchase amount | $ 8,664,000 |  |  |  |  |
Maximum amount authorized by the Board of Directors for repurchases of the Company's common stock | $ 100,000,000 |  |  |  |  |
Repurchases of common stock (in shares) | 0 | 175,735 |  |  |  |
Average repurchase price (in dollars per share) |  | $ 28.39 |  |  |  |
Repurchases of common stock |  | $ 4,989,000 |  |  |  |
Dividends [Abstract] |  |  |  |  |  |
Targeted annual dividend per share (in dollars per share) | $ 1.20 | $ 1.20 |  |  |  |
Quarterly dividend payment amount per share (in dollars per share) |  |  |  | $ 0.30 | $ 0.30 | $ 0.30
Subsequent Event [Member] |  |  |  |  |  |
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract] |  |  |  |  |  |
Stock repurchase program, remaining authorized repurchase amount |  |  | $ 8,664,000 |  |  |
Dividends [Abstract] |  |  |  |  |  |
Quarterly dividend payment amount per share (in dollars per share) |  |  | $ 0.30 |  |  |

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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