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Fair Value of Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 29, 2013
Mar. 31, 2013
Fair value of assets and liabilities measured on a recurring basis    
Number of Interest Rate Derivatives Held 3  
Number of Foreign Currency Derivatives Held 0  
Fair value of assets and liabilities that are measured on a recurring basis | Fair Value Measurements Using Inputs Considered as Level 2
   
Assets    
Marketable securities $ 9,703 $ 8,634
Derivatives 160 0
Liabilities    
Derivatives $ 9,547 $ 3,530