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Income Taxes (Details Textual)) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 30, 2013	Apr. 30, 2012
Income Taxes (Textual) [Abstract]
Provision for income taxes	$ 3,310	$ 1,598
Effective tax rate	28.80%	19.10%

The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit that is attributable to changes in the income tax laws or rates.

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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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