Property and Equipment and Capitalized Internal-Use Software Development Costs - Property and Equipment, Including Capitalized Software Development Costs (Detail) - USD ($) $ in Thousands	Apr. 30, 2015	Apr. 30, 2014
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	$ 44,858	$ 35,610
Less: accumulated depreciation and amortization	(25,804)	(18,605)
Property and Equipment, net	19,054	17,005
Software
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	962	1,407
Computer Equipment
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	3,052	3,380
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	1,888	2,453
Office Equipment
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	2,072	1,827
Capitalized internal-use software development costs
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	29,628	20,245
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	$ 7,256	$ 6,298