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Stockholder's Investments - Schedule of Other Activity in Stockholders' Investments (Details) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Jul. 31, 2017 | Jul. 31, 2016 | Jul. 31, 2015 | Jul. 31, 2014
Class of Stock [Line Items] |  |  |  |
Sale Of Shares At Cost | $ 41 | $ 40 | $ (90) |
Purchase Of Shares At Cost | (610) | (839) | (815) |
Ending Balance, Other Stockholders Equity | 0 | (3,863) | (3,064) | $ (2,159)
Shares Held Rabbi Trust At Cost [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Sale Of Shares At Cost | 1,288 | 1,278 | 2,235 |
Purchase Of Shares At Cost | (925) | (1,017) | (1,035) |
Ending Balance, Other Stockholders Equity | $ (8,124) | $ (8,487) | $ (8,748) | $ (9,948)
Ending Balance, Other Stockholders Equity Shares | 314,082 | 347,081 | 362 | 423
Deferred Compensation [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Sale Of Shares At Cost | $ (1,247) | $ (1,238) | $ (2,325) |
Purchase Of Shares At Cost | 315 | 178 | 220 |
Ending Balance, Other Stockholders Equity | $ 8,124 | $ 4,624 | $ 5,684 | $ 7,789
Ending Balance, Other Stockholders Equity Shares | 314,082 | 201,418 | 252 | 339

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