Commitments and Contingencies - Additional Information (Detail)							9 Months Ended	12 Months Ended
	Nov. 21, 2014 USD ($)	Nov. 13, 2014 USD ($) ft² Term	Sep. 23, 2014	Jun. 04, 2014 USD ($)	Mar. 12, 2013 USD ($)	Jun. 12, 2012 USD ($)	Jan. 31, 2015	Apr. 30, 2015 USD ($)	Apr. 30, 2014 USD ($)	Apr. 30, 2013 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Rental expense								$ 4,100,000	$ 4,400,000	$ 3,800,000
Definitive agreement to divest PowerReviews, expected cash proceed				$ 30,000,000				30,000,000
Definitive agreement expiry date				2015-07
Amount that will be placed into escrow as partial security for the Company's indemnification obligations				$ 4,500,000
Loss on disposal of discontinued operations, net of taxes								10,729,000
Loss on disposal of discontinued operations, net of taxes, previously recognized								9,192,000
Loss on disposal of discontinued operations, net of tax, recognized in current period								1,537,000	$ 9,192,000
Damages sought in shareholder derivative action					$ 91,400,000
Final hearing of shareholder derivative action, date			Nov. 24, 2014
Sales tax liability estimate								1,800,000
Sales tax liability accrual								500,000
Sales tax benefit realized from reduction in estimated liability								1,100,000
Office space | ft²		137,615
Lease commencement date		Jan. 01, 2016
Lease termination period		10 years 6 months
Number of successive periods of five years terms | Term		2
Lease extension period		5 years
Expected lease payments for fiscal year ended April 30, 2016		$ 300,000						4,831,000
Expected lease payments for fiscal year ended April 30, 2017		3,800,000						6,310,000
Expected lease payments for fiscal year ended April 30, 2018		3,800,000						6,081,000
Expected lease payments for fiscal year ended April 30, 2019		3,900,000						4,789,000
Expected lease payments for fiscal year ended April 30, 2020		4,000,000						4,658,000
Expected lease payments for fiscal years ended April 30th thereafter		$ 25,900,000						$ 25,940,000
PowerReviews
Commitments and Contingencies Disclosure [Line Items]
Business acquisition total consideration						$ 150,800,000
Definitive agreement to divest PowerReviews, expected cash proceed				30,000,000
Amount that will be placed into escrow as partial security for the Company's indemnification obligations				$ 4,500,000
Revolving Credit Facility | Credit Facility
Commitments and Contingencies Disclosure [Line Items]
Revolving line of credit with a borrowing capacity	$ 70,000,000
Revolving letter of credit with a borrowing capacity	15,000,000
Revolving line of credit drawn	$ 57,000,000
Loan and security agreement, maturity date							Nov. 21, 2017	Nov. 21, 2017
Revolving Credit Facility | Credit Facility | Daily adjusting LIBOR rate
Commitments and Contingencies Disclosure [Line Items]
Interest above daily adjusting LIBOR rate	3.50%
Revolving Credit Facility | Credit Facility | Swingline Loan
Commitments and Contingencies Disclosure [Line Items]
Revolving line of credit with a borrowing capacity	$ 3,000,000