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Fair Value Measurements (Details 1) - USD ($)
$ in Thousands
3 Months Ended
Jun. 27, 2015
Jun. 28, 2014
Changes in Level 3 instruments measured at fair value on a recurring basis    
Balance as of beginning of period $ 10,312 $ 20,160
Total realized and unrealized gains (losses) included in other comprehensive income 97 544
Balance as of end of period $ 10,409 $ 20,704