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Summary of Significant Accounting Policies Subsequent Events (Details) - $ / shares | 12 Months Ended |  |
--- | --- | --- | ---
Jul. 31, 2016 | Jul. 31, 2015 | Jul. 31, 2014 | Jul. 31, 2013 | Oct. 31, 2015 | Sep. 10, 2015
Subsequent Event [Line Items] |  |  |  |  |  |
Document Period End Date |  | Jul. 31, 2015 |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  |  | 2,000,000
Class A Nonvoting Common Stock [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Percentage Increase In Dividend | 1.30% |  |  |  |  |
Dividends | $ 0.81 | $ 0.80 | $ 0.78 | $ 0.76 |  |
Dividends Payable |  |  |  |  | $ 0.2025 |

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