Intangible Assets, Goodwill and Long-Lived Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Apr. 30, 2016	Jan. 31, 2016	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Intangible Assets And Goodwill [Line Items]
Aggregate amortization expense for amortizable intangibles			$ 27,962	$ 16,015	$ 12,984
Aggregate amortization expense for amortizable intangibles for continuing operations			27,962	$ 16,015	$ 12,920
Pre-tax, non-cash goodwill impairment charge	$ 0	$ 9,113	$ 9,113