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Stockholder's Investments - Schedule of Capital Stock (Details) - USD ($) $ in Thousands | Jul. 31, 2015 | Jul. 31, 2014 | Jul. 31, 2013 | Jul. 31, 2012
--- | --- | --- | --- | ---
Class of Stock [Line Items] |  |  |  |
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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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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