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Summary of Significant Accounting Policies (Narrative) (Details) $ in Millions | 12 Months Ended
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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 |

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