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Summary of Cash and Cash Equivalents (Detail) (USD $)
In Thousands, unless otherwise specified |
Apr. 30, 2014
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Apr. 30, 2013
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|---|---|---|
| Cash and Cash Equivalents [Line Items] | ||
| Total cash and cash equivalents | $ 31,934 | $ 25,045 |
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Demand deposit accounts
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| Cash and Cash Equivalents [Line Items] | ||
| Total cash and cash equivalents | 24,721 | 16,522 |
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Money Market Funds
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| Cash and Cash Equivalents [Line Items] | ||
| Total cash and cash equivalents | 6,971 | 1,314 |
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Certificates of Deposit
|
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| Cash and Cash Equivalents [Line Items] | ||
| Total cash and cash equivalents | 242 | |
|
U.S. Treasury securities
|
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| Cash and Cash Equivalents [Line Items] | ||
| Total cash and cash equivalents | $ 7,209 |