Income Taxes (Details) (USD $)	6 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jan. 31, 2012
Income Taxes (Textual) [Abstract]
Current income taxes payable			$ 2,419,000
Current domestic federal and state taxes			778,000
Prepaid foreign taxes	2,775,000
Current foreign taxes			1,641,000
Prepaid domestic federal and state taxes.	2,242,000
Prepaid income taxes	5,017,000
Net reduction in consolidated income tax expenses	150,000
Recognized tax benefit	3,300,000
Reversed estimates of potential penalties and interest	1,900,000
Effective tax rate having impact	20.40%
Tax amount without the effect	$ 5,300,000
Effective tax rate without impact	22.60%	30.40%
Federal statutory rate	34.00%