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Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Apr. 30, 2013	Apr. 30, 2012
Income Tax Disclosure [Abstract]
Income tax expense	$ 473,000	$ 303,000
Estimated effective tax rate	9.10%	10.40%
Unrecognized tax benefits	$ 3,000,000

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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