Summary of Significant Accounting Policies Recently Issued Accounting Standards (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Recently Issued Accounting Standards [Abstract]
Excess Tax Benefit from Share-based Compensation, Operating Activities	$ 51,804	$ 6,290
Impact of Excess Tax Benefits on EPS	$ 1.29
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	$ 69,480	$ 11,524