Commitments and Contingencies - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended				0 Months Ended
	Mar. 12, 2013	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012	Jun. 04, 2014 Subsequent event	Jun. 12, 2012 PowerReviews	Apr. 30, 2014 Minimum	Apr. 30, 2014 Maximum
Commitments and Contingencies Disclosure [Line Items]
Rental expense		$ 4,400,000	$ 3,800,000	$ 1,700,000
Shares of common Stock issued in business acquisition						6,400,000
Business acquisition total consideration						150,754,000
Number of vested and unvested options equivalent to the acquired company's option		6,901,000				1,700,000
Definitive agreement to divest PowerReviews, expected cash proceed					30,000,000
Estimated loss on disposal of discontinued operations, net of tax		(9,192,000)
Damages sought in shareholder derivative action	91,400,000
Sales tax liability estimate							2,500,000	3,200,000
Sales tax liability accrual		$ 3,000,000