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Adoption of Accounting Standards and Updates Secured Credit Facilities (Details) - USD ($)
Apr. 30, 2016
Jul. 31, 2015
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