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Stockholder's Investments - Schedule of Other Activity in Stockholders' Investments (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2016 | Jul. 31, 2015
Class of Stock [Line Items] |  |  |  |
Sale Of Shares At Cost | $ 0 | $ 41 | $ 40 |
Purchase Of Shares At Cost | 0 | (610) | (839) |
Ending Balance, Other Stockholders Equity | 0 | 0 | (3,863) | $ (3,064)
Shares Held Rabbi Trust At Cost [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Sale Of Shares At Cost | 977 | 1,288 | 1,278 |
Purchase Of Shares At Cost | (1,075) | (925) | (1,017) |
Ending Balance, Other Stockholders Equity | $ (8,222) | $ (8,124) | $ (8,487) | $ (8,748)
Ending Balance, Other Stockholders Equity Shares | 299,916 | 314,082 | 347,081 | 362,025
Deferred Compensation [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Sale Of Shares At Cost | $ (977) | $ (1,247) | $ (1,238) |
Purchase Of Shares At Cost | 1,075 | 315 | 178 |
Ending Balance, Other Stockholders Equity | $ 8,222 | $ 8,124 | $ 4,624 | $ 5,684
Ending Balance, Other Stockholders Equity Shares | 299,916 | 314,082 | 201,418 | 252,261

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- Definition Amount represents the sale of Class A Nonvoting Common Stock resulting from deferred compensation transactions (purchases or sales). + References No definition available. + Details
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