Accrued Expenses and Other Current Liabilities - Accrued Liabilities, Including Other Liabilities (Detail) - USD ($) $ in Thousands	Apr. 30, 2015	Apr. 30, 2014
Payables and Accruals [Abstract]
Accrued compensation	$ 10,675	$ 11,834
Accrued taxes	3,629	4,808
Accrued revenue share	4,940	3,050
Accrued other liabilities	8,153	7,379
Total accrued expenses and other current liabilities	$ 27,397	$ 27,071