Credit Facility (Details) - USD ($)	Jul. 31, 2019	Jul. 31, 2018
Line of Credit Facility [Line Items]
Less current portion of long-term debt	$ 0	$ 17,211,000
Non-current portion of long-term debt	$ 165,000,000	148,087,000
Prior Credit Facility
Line of Credit Facility [Line Items]
Amount outstanding under Secured Credit Facility, net		165,298,000
Less current portion of long-term debt		17,211,000
Non-current portion of long-term debt		148,087,000
Prior Credit Facility | Term Loan Facility
Line of Credit Facility [Line Items]
Term Loan Facility		120,121,000
Less unamortized deferred financing costs related to Term Loan Facility		3,427,000
Amount outstanding under Secured Credit Facility, net		116,694,000
Prior Credit Facility | Revolving Loan Facility
Line of Credit Facility [Line Items]
Amount outstanding under Secured Credit Facility, net		$ 48,604,000