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Financial Instruments (Details 1) - USD ($)
$ in Thousands
Dec. 30, 2017
Apr. 01, 2017
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value $ 1,111,708 $ 1,310,037
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (10,830) (15,101)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 594,557 258,680
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (22,242) (17,571)
Available-for-Sale Securities, Fair Value, Total 1,706,265 1,568,717
Available-for-Sale Securities, Gross Unrealized Losses, Total (33,072) (32,672)
Non-financial institution securities [Member]    
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 123,647 68,850
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (580) (492)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 15,312 1,022
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (210) (4)
Available-for-Sale Securities, Fair Value, Total 138,959 69,872
Available-for-Sale Securities, Gross Unrealized Losses, Total (790) (496)
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 36,918 64,895
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (164) (223)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 7,076 0
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (62) 0
Available-for-Sale Securities, Fair Value, Total 43,994 64,895
Available-for-Sale Securities, Gross Unrealized Losses, Total (226) (223)
Foreign Government Debt Securities [Member]    
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value   64,857
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses   (51)
Available-for-Sale Securities, 12 Months or Greater, Fair Value   0
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses   0
Available-for-Sale Securities, Fair Value, Total   64,857
Available-for-Sale Securities, Gross Unrealized Losses, Total   (51)
Mortgage-Backed Securities [Member]    
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 644,939 811,058
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (6,632) (11,872)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 352,193 139,931
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (8,692) (2,885)
Available-for-Sale Securities, Fair Value, Total 997,132 950,989
Available-for-Sale Securities, Gross Unrealized Losses, Total (15,324) (14,757)
Asset-backed Securities [Member]    
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 136,281 119,845
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (596) (651)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 48,739 4,689
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (411) (35)
Available-for-Sale Securities, Fair Value, Total 185,020 124,534
Available-for-Sale Securities, Gross Unrealized Losses, Total (1,007) (686)
Debt Mutual Fund [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 89,911 88,676
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (11,439) (12,674)
Available-for-Sale Securities, Fair Value, Total 89,911 88,676
Available-for-Sale Securities, Gross Unrealized Losses, Total (11,439) (12,674)
Bank Loans [Member]    
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 29,161 15,139
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (183) (106)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 500 0
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (5) 0
Available-for-Sale Securities, Fair Value, Total 29,661 15,139
Available-for-Sale Securities, Gross Unrealized Losses, Total (188) (106)
Commercial Mortgage Backed Securities [Member]    
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 134,826 165,393
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (1,111) (1,706)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 80,826 24,362
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (1,423) (1,973)
Available-for-Sale Securities, Fair Value, Total 215,652 189,755
Available-for-Sale Securities, Gross Unrealized Losses, Total (2,534) $ (3,679)
Equity Securities [Member]    
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 5,936  
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (1,564)  
Available-for-Sale Securities, 12 Months or Greater, Fair Value 0  
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses 0  
Available-for-Sale Securities, Fair Value, Total 5,936  
Available-for-Sale Securities, Gross Unrealized Losses, Total $ (1,564)