Income Taxes - Additional Information (Detail) - USD ($) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jul. 31, 2017 |
Jul. 31, 2016 |
Jul. 31, 2017 |
Jul. 31, 2016 |
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| Income Taxes Disclosure [Line Items] | ||||
| Income tax provision | $ 35,000 | $ 14,581,000 | $ 304,000 | $ 14,835,000 |
| Irish Operations [Member] | ||||
| Income Taxes Disclosure [Line Items] | ||||
| Charge to deferred tax liability related to the foreign income | $ 14,700,000 | |||
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- Definition Income taxes disclosure. No definition available.
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- Definition Amount of deferred foreign income tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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