Components of Accrued Expenses (Detail) - USD ($) $ in Thousands	Oct. 31, 2018	Jul. 31, 2018
Accrued Expenses [Line Items]
Accrued sales taxes	$ 21,418	$ 21,390
Accrued other taxes	7,318	8,414
Accrued compensation	21,947	25,603
Accrued interest	450	1,437
Accrued audit, tax and legal	2,829	3,264
Accrued contract labor	3,773	1,932
Accrued worker's compensation	6,148	6,126
Accrued other	21,046	20,164
Accrued expenses	$ 84,929	$ 88,330