Purchase Price (Detail) (USD $) In Thousands, unless otherwise specified					12 Months Ended
	Apr. 30, 2013 Power Reviews	Jun. 12, 2012 Power Reviews	Apr. 30, 2013 Power Reviews Developed Technology	Apr. 30, 2013 Power Reviews Customer Relationships	Apr. 30, 2013 Longboard Media, Inc	Nov. 05, 2012 Longboard Media, Inc	Apr. 30, 2013 Longboard Media, Inc Customer Relationships
Business Acquisition [Line Items]
Cash and cash equivalents	$ 745				$ 588
Cash					26,855
Restricted cash	104
Common stock					5,802
Accounts receivable	497				2,899
Prepaid expenses and other current assets	156				53
Property and equipment	280
Current deferred tax asset	239				437
Domain name (indefinite useful life)	800
Intangible assets subject to amortization			5,400	35,000			11,300
Total identified intangibles	41,200				11,300
Goodwill	113,152				28,681
Deferred tax asset-long term					1,042
Total assets acquired	156,373				45,000
Accounts payable	(304)				(3,006)
Accrued liabilities	(2,167)				(1,112)
Deferred revenue	(2,627)
Deferred tax liability					(3,955)
Non-current deferred tax liability	(521)
Total liabilities assumed	(5,619)				(8,073)
Net assets acquired	150,754				36,927
Business Acquisition, Cost of Acquired Entity, Cash Paid	31,059	31,100				26,900
Common stock	109,745
Fair value of contingent consideration	9,950				4,270	4,300
Total consideration	150,754
Total consideration					$ 36,927