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Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Jan. 31, 2014
Income Tax Disclosure [Abstract]
Prepaid income taxes	$ 1,818,000		$ 2,177,000
Prepaid foreign taxes	200,000		600,000
Prepaid domestic federal and state taxes	$ 1,600,000		$ 1,600,000
Effective tax rate without impact	23.00%	20.00%
Federal statutory rate	34.00%

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Prepaid domestic federal and state taxes.

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Prepaid foreign taxes.

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

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-Publisher FASB

-Name Accounting Standards Codification

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

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Amount of asset related to consideration paid in advance for income and other taxes that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

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