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Financial Instruments (Details 1) - USD ($)
$ in Thousands
Jun. 27, 2015
Mar. 28, 2015
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value $ 1,078,233 $ 1,095,972
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (11,077) (5,009)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 122,227 118,042
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (6,967) (6,331)
Available-for-Sale Securities, Fair Value, Total 1,200,460 1,214,014
Available-for-Sale Securities, Gross Unrealized Losses, Total (18,044) (11,340)
Non-financial institution securities [Member]    
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 31,065 7,190
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (80) (6)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 0 0
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses 0 0
Available-for-Sale Securities, Fair Value, Total 31,065 7,190
Available-for-Sale Securities, Gross Unrealized Losses, Total (80) (6)
Auction Rate Securities [Member]    
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 0 0
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses 0 0
Available-for-Sale Securities, 12 Months or Greater, Fair Value 10,409 10,312
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (91) (188)
Available-for-Sale Securities, Fair Value, Total 10,409 10,312
Available-for-Sale Securities, Gross Unrealized Losses, Total (91) (188)
Municipal Bonds [Member]    
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 21,356 10,014
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (266) (94)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 1,852 1,931
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (72) (58)
Available-for-Sale Securities, Fair Value, Total 23,208 11,945
Available-for-Sale Securities, Gross Unrealized Losses, Total (338) (152)
U.S. Government and Agency Securities [Member]    
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 66,802 451,296
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (46) (129)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 0 0
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses 0 0
Available-for-Sale Securities, Fair Value, Total 66,802 451,296
Available-for-Sale Securities, Gross Unrealized Losses, Total (46) (129)
Mortgage-Backed Securities [Member]    
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 734,577 448,770
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (8,275) (3,169)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 43,349 49,207
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (1,192) (1,327)
Available-for-Sale Securities, Fair Value, Total 777,926 497,977
Available-for-Sale Securities, Gross Unrealized Losses, Total (9,467) (4,496)
Asset-backed Securities [Member]    
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 84,268 75,009
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (331) (159)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 0 0
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses 0 0
Available-for-Sale Securities, Fair Value, Total 84,268 75,009
Available-for-Sale Securities, Gross Unrealized Losses, Total (331) (159)
Debt Mutual Fund [Member]    
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 38,569 38,608
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (1,431) (1,392)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 55,779 56,592
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (5,571) (4,758)
Available-for-Sale Securities, Fair Value, Total 94,348 95,200
Available-for-Sale Securities, Gross Unrealized Losses, Total (7,002) (6,150)
Bank Loans [Member]    
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 56,551 65,085
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (69) (60)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 10,293 0
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (10) 0
Available-for-Sale Securities, Fair Value, Total 66,844 65,085
Available-for-Sale Securities, Gross Unrealized Losses, Total (79) $ (60)
Commercial Mortgage Backed Securities [Member]    
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 45,045  
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (579)  
Available-for-Sale Securities, 12 Months or Greater, Fair Value 545  
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (31)  
Available-for-Sale Securities, Fair Value, Total 45,590  
Available-for-Sale Securities, Gross Unrealized Losses, Total $ (610)