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Commitments and Contingencies - Additional Information (Detail) (USD $)
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0 Months Ended | 12 Months Ended | 0 Months Ended | |||||
|---|---|---|---|---|---|---|---|---|
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Mar. 12, 2013
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Apr. 30, 2014
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Apr. 30, 2013
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Apr. 30, 2012
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Jun. 04, 2014
Subsequent event
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Jun. 12, 2012
PowerReviews
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Apr. 30, 2014
Minimum
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Apr. 30, 2014
Maximum
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| 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 | |||||||