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Adoption of Accounting Standards and Updates Secured Credit Facilities (Details) - USD ($) | Apr. 30, 2016 | Jul. 31, 2015
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Debt Instrument [Line Items] |  |
Net deferred financing cost recorded as a non-current asset | $ 3,739,000 | $ 0
Secured Credit Facility | Term Loan Facility [Member] |  |
Debt Instrument [Line Items] |  |
Net deferred financing cost recorded as a direct deduction of non-current portion of debt | $ 6,231,000 |

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