Fair Value Measures (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Jan. 31, 2020	Jul. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 12,376	$ 12,389
Assets, Fair Value Disclosure	12,376	12,389
Total Liabilities	438,454	411,510
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	12,376	12,389
Assets, Fair Value Disclosure	12,376	12,389
Total Liabilities	438,454	411,510
Fixed Rate Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term variable rate debt, including current portion	424,854	411,510
Long-term fixed rate debt, including current portion	424,854	411,510
Fixed Rate Debt | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term variable rate debt, including current portion	424,854	411,510
Long-term fixed rate debt, including current portion	424,854	411,510
Variable Rate Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Revolving loan facility	$ 13,600	0
Variable Rate Debt | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Revolving loan facility		$ 0