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Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
Income Taxes (Details) (USD $)	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Income Taxes (Textual) [Abstract]
Tax expense	$ 2,524,000	$ 875,000	$ 4,122,000	$ 1,590,000
Effective tax rate	23.60%	16.00%	21.70%	23.80%
Foreign Tax Authority [Member]
Income Taxes (Textual) [Abstract]
Income tax examination that would impact tax rate			$ 500,000

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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