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Income Taxes (Details) (USD $)	3 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Jan. 31, 2013
Income Taxes (Textual) [Abstract]
Prepaid income taxes	$ 5,528,000		$ 5,591,000
Prepaid foreign taxes	3,600,000		4,200,000
Prepaid domestic federal and state taxes	1,900,000		1,400,000
Net reduction in consolidated income tax expenses			141,000
Recognized tax benefit	3,300,000
Reversed estimates of potential penalties and interest	$ 1,900,000
Effective tax rate without impact	20.40%	23.60%
Federal statutory rate	34.00%

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Potential income tax penalties and interest after revision.

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Prepaid domestic federal and state taxes.

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Prepaid foreign taxes.

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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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The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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Carrying amount as of the balance sheet date of payments made in advance for income and other taxes, which will be charged against earnings within one year or the normal operating cycle, if longer.

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The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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