Intangible Assets, Goodwill and Long-Lived Assets - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Goodwill And Other Intangible Assets [Line Items]
Aggregate amortization expense for amortizable intangibles	$ 16,015	$ 12,984	$ 11,037
Aggregate amortization expense for amortizable intangibles for continuing operations	16,015	12,920	10,460
Goodwill impairment	$ 0	$ 0	$ 0