Acquired Intangible Asset Net - Additional Information (Detail) - USD ($) $ in Thousands		1 Months Ended			12 Months Ended
	Jul. 02, 2014	Jan. 31, 2014	Mar. 31, 2013	Dec. 31, 2012	Apr. 30, 2015	Apr. 30, 2014
Acquired Intangible Assets Amortization [Line Items]
Impairment of acquired intangible assets					$ 0	$ 2,500
Accrued expenses and other current liabilities					27,397	27,071
Acquired intangible assets					11,498	13,388
Amortization of acquired intangible assets					1,900	1,100
Shopzilla Customer Contracts
Acquired Intangible Assets Amortization [Line Items]
Purchase of customer contracts, cash remitted				$ 4,200
Shopzilla Customer Contracts | Holdback Liabilities
Acquired Intangible Assets Amortization [Line Items]
Accrued expenses and other current liabilities				500
Customer Relationships | Shopzilla Customer Contracts
Acquired Intangible Assets Amortization [Line Items]
Purchase of customer contracts, purchase price		$ 30	$ 200	$ 4,700
Purchase of customer contracts, remaining useful life of acquired contractual customer relationships				10 years
Discontinued Operations
Acquired Intangible Assets Amortization [Line Items]
Impairment of acquired intangible assets	$ 2,500					2,500
Acquired intangible assets	32,813				$ 0	32,813
Discontinued Operations | Customer Relationships
Acquired Intangible Assets Amortization [Line Items]
Impairment of acquired intangible assets	2,354					2,354
Discontinued Operations | Developed Technology
Acquired Intangible Assets Amortization [Line Items]
Impairment of acquired intangible assets	$ 146					$ 146