Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended				9 Months Ended	0 Months Ended
	Mar. 12, 2013	Jan. 31, 2014	Jan. 31, 2014 Minimum	Jan. 31, 2014 Maximum	Jan. 31, 2014 Pending Litigation	Jun. 12, 2012 Power Reviews
Commitments and Contingencies Disclosure [Line Items]
Cash paid in business acquisition						$ 31.1
Shares of common stock issued in business acquisition						6.4
Business acquisition total consideration						150.8
Number of vested and unvested options equivalent to the acquired company's option						1.7
DOJ's proposed motion					divest all assets it acquired in conjunction with the acquisition of PowerReviews to a divestiture buyer; must provide cross-network syndication of content to the customers of the divestiture buyer for free for four years; waive trade secret restrictions for any PowerReviews or Company employees hired by the divestiture buyer; provide the divestiture buyer with a list of the customers the Company had acquired or renewed since its acquisition of PowerReviews; enter into a cross license for intellectual property with the divestiture buyer; waive any breach of contract claims against customers that sign a contract with the divestiture buyer; license its platform (including any improvements) to the divestiture buyer if the Company transfers to the divestiture buyer less than 80% of PowerReviews customers, based on revenue, the Company acquired; and notify the DOJ in advance of any transactions it contemplates over $10 million.
Loss contingency, Percentage of transfers to divestiture buyer					80.00%
Loss contingency, amount to be notified in advance for contemplates transaction					10
Damages sought in shareholder derivative action	91.4
Sales tax liability estimate			2.3	2.9
Sales tax liability accrual		$ 2.6