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Derivative Financial Instruments (Details 3) (USD $)
 3 Months Ended 9 Months Ended
Oct. 27, 2012
Oct. 29, 2011
Oct. 27, 2012
Oct. 29, 2011
Gains (losses) before taxes recognized on the derivative instruments designated as cash flow hedges in other comprehensive income ("OCI") and net earnings        
Foreign exchange currency cash flow hedge unrealized gain to be recognized in other income or cost of product sales over the following 12 months $ 2,600,000   $ 2,600,000  
Net after-tax derivative activity recorded in accumulated other comprehensive income        
Beginning balance gain (loss) 7,993,000 (5,619,000) 4,259,000 (1,789,000)
Net gains (losses) from changes in cash flow hedges (1,892,000) 3,059,000 4,875,000 (3,366,000)
Net losses (gains) reclassified to income (3,471,000) 3,027,000 (6,504,000) 5,622,000
Ending balance gain (loss) 2,630,000 467,000 2,630,000 467,000
Cost of sales
        
Gains (losses) before taxes recognized on the derivative instruments designated as cash flow hedges in other comprehensive income ("OCI") and net earnings        
Gain/(Loss) Recognized in OCI (1,876,000) 3,970,000 4,942,000 (3,239,000)
Gain/(Loss) Reclassified from Accumulated OCI into Income/(Loss) 3,697,000 (3,470,000) 6,854,000 (6,540,000)
Other income/expense
        
Gains (losses) before taxes recognized on the derivative instruments designated as cash flow hedges in other comprehensive income ("OCI") and net earnings        
Gain/(Loss) Recognized in OCI (174,000) 26,000 448,000 (585,000)
Gain/(Loss) Reclassified from Accumulated OCI into Income/(Loss) $ 288,000 $ (20,000) $ 584,000 $ (9,000)