Components of Accrued Expenses (Detail) - USD ($) $ in Thousands	Jan. 31, 2018	Jul. 31, 2017
Accrued Expenses [Line Items]
Accrued taxes	$ 5,215	$ 2,272
Accrued compensation	30,638	10,678
Accrued interest	4,190	1,366
Accrued audit, tax and legal	2,693	2,759
Accrued contract labor	1,538	1,632
Accrued worker's compensation	6,347
Accrued other	24,050	19,191
Accrued expenses	$ 74,671	$ 37,898