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Derivative Financial Instruments (Details 2) - USD ($)
6 Months Ended 12 Months Ended
Aug. 04, 2018
Jan. 28, 2017
May 05, 2018
Feb. 03, 2018
Jul. 29, 2017
Apr. 29, 2017
Forward contracts designated as hedging instruments            
Net unrealized gain (loss) in accumulated other comprehensive income (loss) related to cash flow hedges $ (142,000) $ 5,400,000 $ (6,285,000) $ (14,369,000) $ (8,751,000) $ 4,948,000
Foreign exchange currency cash flow hedge unrealized gain to be recognized in cost of product sales over the following 12 months (2,500,000)          
Interest rate swap cash flow hedge unrealized gain to be recognized in interest expense after the following 12 months $ 1,200,000          
Cash flow hedges | Europe | Derivatives designated as hedging instruments            
Forward contracts designated as hedging instruments            
U.S. dollar forward contracts outstanding, maximum remaining maturity period (in months) 12 months          
Cash flow hedges | Canada | Derivatives designated as hedging instruments            
Forward contracts designated as hedging instruments            
U.S. dollar forward contracts outstanding, maximum remaining maturity period (in months) 12 months          
Foreign exchange currency contracts            
Forward contracts designated as hedging instruments            
Net unrealized gain (loss) in accumulated other comprehensive income (loss) related to cash flow hedges $ (1,300,000)          
Foreign exchange currency contracts | Cash flow hedges | Europe | Derivatives designated as hedging instruments            
Forward contracts designated as hedging instruments            
Total notional amount of derivatives purchased 21,600,000          
Notional amount of derivative outstanding 103,700,000     145,800,000    
Foreign exchange currency contracts | Cash flow hedges | Canada | Derivatives designated as hedging instruments            
Forward contracts designated as hedging instruments            
Notional amount of derivative outstanding 17,400,000     $ 38,700,000    
Interest rate swap            
Forward contracts designated as hedging instruments            
Net unrealized gain (loss) in accumulated other comprehensive income (loss) related to cash flow hedges $ 1,200,000          
Interest rate swap | Cash flow hedges | Derivatives designated as hedging instruments            
Forward contracts designated as hedging instruments            
Total notional amount of derivatives purchased   21,500,000        
Notional amount of derivative outstanding   $ 21,500,000        
Fixed rate of interest rate swap designated as a cash flow hedge (as a percent) 3.06%