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Summary of Significant Accounting Policies Subsequent Events (Details) - $ / shares | 12 Months Ended |
--- | --- | ---
Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2016 | Jul. 31, 2015 | Oct. 31, 2017
Subsequent Event [Line Items] |  |  |  |  |
Document Period End Date |  | Jul. 31, 2017 |  |  |
Class A Nonvoting Common Stock [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Percentage Increase In Dividend |  | 1.20% |  |  |
Dividends | $ 0.83 | $ 0.82 | $ 0.81 | $ 0.80 |
Dividends Payable |  |  |  |  | $ 0.2075

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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