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Income Taxes Difference of Effective Tax Rate from Federal Tax Rate (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2011
Reconciliation of Statutory Federal Tax Rate [Line Items]      
Federal tax, at statutory rate $ 49,467 $ 28,813 $ 11,204
State tax, net of federal benefit (65) 137 251
Impact of international operations (50,275) (53,499) (30,308)
Repatriation of Foreign Earnings 12,661 1,364 2,364
Foreign tax credits (8,203) (411) (241)
Costs incurred for stock of acquired business 67 98 (3)
Tax credits (excluding foreign tax credits) (11,782) (9,677) (9,697)
Amortization of deferred charge 0 323 657
U.S. losses and tax credits for which no benefit has been realized 5,978 28,275 24,574
Stock based compensation expense 1,895 2,947 2,663
Non-deductible meals and entertainment 1,021 1,096 1,117
Other, net 1,937 (529) 847
Income Tax Expense (Benefit) $ 2,701 $ (1,063) $ 3,428