Changes in Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Apr. 30, 2017 |
Apr. 30, 2016 |
Apr. 30, 2015 |
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| Income Taxes [Line Items] | |||
| Unrecognized tax benefits, beginning of year | $ 2,095 | $ 2,423 | $ 2,701 |
| Settlement with tax authority | (1,963) | (497) | |
| Additions based on tax positions related to the current year | 383 | 1,305 | 219 |
| Additions based on tax positions related to prior years | 330 | ||
| Unrecognized tax benefits, end of year | $ 2,478 | $ 2,095 | $ 2,423 |
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- Definition Income Taxes [Line Items] No definition available.
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- Definition Amount of unrecognized tax benefits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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