Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands	12 Months Ended
	Jul. 31, 2016 USD ($) yr	Jul. 31, 2015 USD ($)	Jul. 31, 2014 USD ($)
Interest rate charged on past due accounts	18.00%
Document Fiscal Year Focus	2016
Interest capitalized on real estate development	$ 0	$ 0	$ 0
Impairment to goodwill or intangible assets	$ 0	0	0
Average remaining period (in years) for initiation fees recognized | yr	14
Refundable period (in years) for initiation fees | yr	30
Advertising expense	$ 32,300	27,500	$ 25,700
Prepaid advertising costs	$ 300	$ 310