Components of Accrued Expenses (Detail) - USD ($) $ in Thousands	Jan. 31, 2017	Jul. 31, 2016
Accrued Expenses [Line Items]
Accrued taxes	$ 2,509	$ 3,068
Accrued compensation	7,970	9,590
Accrued interest	1,293	1,346
Accrued audit, tax and legal	2,884	2,544
Accrued contract labor	3,768	2,966
Accrued other	21,193	18,226
Accrued expenses	$ 39,617	$ 37,740