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Differences Between the Statutory U.S. Federal Income Tax Rate and the Company's Effective Tax Rate (Detail)	1 Months Ended	11 Months Ended	12 Months Ended
	Jan. 31, 2018	Dec. 31, 2017	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Income Tax Disclosure [Abstract]
Expected provision at statutory U.S. federal tax rate	21.00%	35.00%	33.80%	35.00%	35.00%
State and local income taxes, net of federal tax benefit			2.30%	3.10%	3.70%
Foreign taxes			(3.40%)	(2.90%)	(2.00%)
Federal rehabilitation tax credit					(1.90%)
Net impact of U.S. tax reform			24.70%
Other			1.20%	0.30%	1.10%
Effective tax rate			58.60%	35.50%	35.90%

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage 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 changes in the income tax rates.

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Percentage 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 applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage 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 tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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