Reportable Segment Information (Parenthetical) (Detail) - USD ($) $ in Thousands	Jan. 31, 2016	Jul. 31, 2015	Jan. 31, 2015	Jul. 31, 2014
Segment Reporting Information [Line Items]
Cash and cash equivalents	$ 120,067	$ 123,800	$ 116,163	$ 114,540
Corporate
Segment Reporting Information [Line Items]
Cash and cash equivalents	$ 89,100	$ 86,200