Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Oct. 31, 2017 |
Jul. 31, 2017 |
Oct. 31, 2016 |
Oct. 31, 2017 |
Oct. 31, 2016 |
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| Income Taxes Disclosure [Line Items] | |||||
| Income tax provision (benefit) | $ 1,154 | $ (420) | $ 1,458 | $ 14,415 | |
| Tax expense attributable to shift in jurisdictions where income is earned | 1,800 | ||||
| Irish Operations [Member] | |||||
| Income Taxes Disclosure [Line Items] | |||||
| Charge to deferred tax liability related to the foreign income | $ 14,700 | ||||
| Reversal of tax reserves for uncertain tax positions due to the expiration of statute of limitations | $ 600 | ||||
| X | ||||||||||
- Definition Income tax expense (benefit), change in jurisdictions. No definition available.
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| X | ||||||||||
- Definition Income taxes disclosure. No definition available.
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| X | ||||||||||
- 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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| X | ||||||||||
- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Details
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