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Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
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12 Months Ended | ||
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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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| Significant Accounting Policies [Line Items] | |||
| Foreign currency transaction gains and losses | $ 400,000 | $ 400,000 | $ (400,000) |
| Allowance for doubtful accounts | 2,324,000 | 2,371,000 | |
| Stock-based expense | 14,468,000 | 22,453,000 | 7,710,000 |
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Bad Debts
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| Significant Accounting Policies [Line Items] | |||
| Prior period reclassification adjustment | 2,900,000 | 1,100,000 | |
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Information Technology
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| Significant Accounting Policies [Line Items] | |||
| Prior period reclassification adjustment | $ 3,800,000 | $ 2,100,000 | |