Estimated Useful Lives of Property Plant and Equipment (Detail)	9 Months Ended
	Jan. 31, 2014
Computer Equipment
Property Plant And Equipment Estimated Useful Lifes [Line Items]
Estimated useful life	3 years
Furniture and Fixtures
Property Plant And Equipment Estimated Useful Lifes [Line Items]
Estimated useful life	5 years
Office Equipment
Property Plant And Equipment Estimated Useful Lifes [Line Items]
Estimated useful life	5 years
Software
Property Plant And Equipment Estimated Useful Lifes [Line Items]
Estimated useful life	3 years
Leasehold Improvements
Property Plant And Equipment Estimated Useful Lifes [Line Items]
Estimated useful life	Shorter of estimated useful life or the lease term