Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended
	Jul. 31, 2015	Jul. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Weighted-average period for amortization of intangible assets	6 years
Amortization expense of intangible assets	$ 2,200,000	$ 161,000
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted-average period for amortization of intangible assets	5 years
Developed technology
Finite-Lived Intangible Assets [Line Items]
Weighted-average period for amortization of intangible assets	6 years
Patents, trademarks, and tradenames
Finite-Lived Intangible Assets [Line Items]
Weighted-average period for amortization of intangible assets	5 years