Income Taxes - Income Tax (Benefit) Provision for Continuing Operations Computed Using Federal Statutory Income Tax Rate (Parenthetical) (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
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Jan. 31, 2018 |
Jan. 31, 2017 |
Jan. 31, 2016 |
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| Income Tax Disclosure [Abstract] | |||
| Income tax reconciliation other adjustments included in other non-deductible expenses | $ (0.1) | $ 0.1 | $ (0.2) |
| X | ||||||||||
- References No definition available.
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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