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Income Taxes - Additional Information (Detail) (USD $)	6 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Jul. 31, 2014	Jan. 31, 2014
Income Tax Disclosure [Abstract]
Federal corporate income tax rate	35.00%
Prepaid income taxes included in prepaid expenses and other current assets	$ 1,641,000
Accrued income taxes included in accrued expenses		303,000
Net deferred income tax liabilities	$ 11,000	$ 114,000
Federal state and local income tax examination applicability description	No longer subject to federal, state and local income tax examinations by tax authorities for its fiscal years ended on or before January 31, 2010.

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due. This amount is the total of current and noncurrent accrued income taxes.

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- Definition

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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