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

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