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Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Apr. 30, 2015	Apr. 30, 2014	Jan. 31, 2015
Income Tax Disclosure [Abstract]
Federal corporate income tax rate	35.00%	35.00%
Accrued income taxes included in accrued expenses	$ 3,446,000us-gaap_AccruedIncomeTaxes		$ 176,000us-gaap_AccruedIncomeTaxes
Net deferred tax liabilities	$ 881,000us-gaap_DeferredTaxAssetsLiabilitiesNet		$ 1,010,000us-gaap_DeferredTaxAssetsLiabilitiesNet
Federal, state and local income tax examinations 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, 2011 except for a few exceptions including California where the open period is one year longer.

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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