Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Adoption of New Accounting Pronouncement (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
New Accounting Pronouncement, Early Adoption [Line Items]
Excess Tax Benefit from Share-based Compensation, Operating Activities	$ 0	$ 2,971	$ 2,289
Restatement Adjustment [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Excess Tax Benefit from Share-based Compensation, Operating Activities	$ 14,700
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]	1.292