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Stockholder's Investments - Schedule of Capital Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Jul. 31, 2017 | Jul. 31, 2016 | Jul. 31, 2015 | Jul. 31, 2014
Class of Stock [Line Items] |  |  |  |
Noncumulative Cash Dividend | $ 0.01665 |  |  |
Common Stock, Value, Issued | $ 548 | $ 548 | $ 548 | $ 548
Common Class A [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common Stock, Shares Authorized | 100,000,000 | 100,000,000 |  |
Common Stock, Shares, Issued | 51,261,487 | 51,261,487 |  |
Common Stock, Value, Issued | $ 513 | $ 513 |  |
Class B Voting Common Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common Stock, Shares Authorized | 10,000,000 | 10,000,000 |  |
Common Stock, Shares, Issued | 3,538,628 | 3,538,628 |  |
Common Stock, Value, Issued | $ 35 | $ 35 |  |
Noncumulative Preferred Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred Stock, Shares Authorized | 5,000,000 | 5,000,000 |  |
6% Cumulative [Member] | Cumulative Preferred Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred Stock, Shares Authorized | 5,000 | 5,000 |  |
1972 Series [Member] | Cumulative Preferred Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred Stock, Shares Authorized | 10,000 | 10,000 |  |
1979 Series [Member] | Cumulative Preferred Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred Stock, Shares Authorized | 30,000 | 30,000 |  |

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