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Summary of Significant Accounting Policies (Narrative) (Details)
$ in Millions
 12 Months Ended
Jul. 31, 2017
USD ($)
yr
Jul. 31, 2016
USD ($)
Jul. 31, 2015
USD ($)
Interest rate charged on past due accounts 18.00%    
Document Fiscal Year Focus 2017    
Impairment to goodwill or intangible assets $ 0.0 $ 0.0 $ 0.0
Average remaining period (in years) for initiation fees recognized | yr 13    
Refundable period (in years) for initiation fees | yr 30    
Advertising expense $ 40.0 32.3 $ 27.5
Prepaid advertising costs $ 0.1 $ 0.3