Expected Amortization Expenses (Detail) - USD ($) $ in Thousands	Apr. 30, 2015	Apr. 30, 2014
Acquired Finite Lived Intangible Assets
Schedule Of Estimated Future Amortization Expense [Line Items]
2016	$ 890
2017	890
2018	254
2019	175
2020	175
Thereafter	364
Finite-Lived Intangible Assets, Net	2,748	$ 528
Capitalized Software
Schedule Of Estimated Future Amortization Expense [Line Items]
2016	3,893
2017	3,593
2018	229
Finite-Lived Intangible Assets, Net	$ 7,715