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Difference of Effective Tax Rate from Federal Tax Rate (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jan. 31, 2012
Jan. 31, 2011
Jan. 31, 2010
Reconciliation of Statutory Federal Tax Rate [Line Items]      
Federal tax, at statutory rate $ 28,813 $ 11,204 $ (6,875)
State tax, net of federal benefit 137 251 833
Impact of international operations including withholding taxes and other reserves (53,499) (30,308) (18,025)
Dividends 1,364 2,364 1,597
Foreign tax credits (411) (241) (241)
Costs incurred for stock of acquired business 98 (3) 562
Tax credits (excluding foreign tax credits) (9,677) (9,697) (7,610)
Amortization of deferred charge 323 657 1,349
U.S. losses and tax credits for which no benefit has been realized 28,275 24,574 25,196
Stock based compensation expense 2,947 2,663 4,986
Non-deductible meals and entertainment 1,096 1,117 943
Other, net (529) 847 (467)
Provision (benefit) for income taxes $ (1,063) $ 3,428 $ 2,248