Summary of Significant Accounting Policies Subsequent Events (Details) (USD $)	12 Months Ended		12 Months Ended
	Jul. 31, 2014	Oct. 31, 2014	Jul. 31, 2015 Nonvoting Common Stock [Member]	Jul. 31, 2014 Nonvoting Common Stock [Member]	Jul. 31, 2013 Nonvoting Common Stock [Member]	Jul. 31, 2012 Nonvoting Common Stock [Member]
Subsequent Event [Line Items]
Document Period End Date	Jul. 31, 2014
Percentage Increase In Dividend	2.60%
Dividends			$ 0.80	$ 0.78	$ 0.76	$ 0.74
Dividends Payable		$ 0.20