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Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Apr. 01, 2017
Available-for-sale securities    
Amortized Cost $ 3,515,826 $ 3,392,034
Available-for-sale Securities, Gross Unrealized Gains (Instant) 1,404 5,571
Available-for-sale Securities, Gross Unrealized Losses (Instant) (40,444) (32,672)
Estimated Fair Value 3,476,786 3,364,933
Marketable equity securities [Member]    
Available-for-sale securities    
Available-for-sale Securities, Gross Unrealized Gains (Instant) 726 0
Available-for-sale Securities, Gross Unrealized Losses (Instant) 0 0
Equity securities, Amortized Cost 7,500 0
Equity securities, Estimated Fair Value 8,226 0
Money Market Funds [Member]    
Available-for-sale securities    
Amortized Cost 1,291,891 298,307
Available-for-sale Securities, Gross Unrealized Gains (Instant) 0 0
Available-for-sale Securities, Gross Unrealized Losses (Instant) 0 0
Estimated Fair Value 1,291,891 298,307
Financial institution securities [Member]    
Available-for-sale securities    
Amortized Cost 434,901 348,797
Available-for-sale Securities, Gross Unrealized Gains (Instant) 0 0
Available-for-sale Securities, Gross Unrealized Losses (Instant) 0 0
Estimated Fair Value 434,901 348,797
Non-financial institution securities [Member]    
Available-for-sale securities    
Amortized Cost 326,219 409,109
Available-for-sale Securities, Gross Unrealized Gains (Instant) 0 647
Available-for-sale Securities, Gross Unrealized Losses (Instant) (1,376) (496)
Estimated Fair Value 324,843 409,260
U.S. Government and Agency Securities [Member]    
Available-for-sale securities    
Amortized Cost 58,913 130,749
Available-for-sale Securities, Gross Unrealized Gains (Instant) 1 8
Available-for-sale Securities, Gross Unrealized Losses (Instant) (272) (223)
Estimated Fair Value 58,642 130,534
Foreign Government and Agency Securities [Member]    
Available-for-sale securities    
Amortized Cost 179,957 322,172
Available-for-sale Securities, Gross Unrealized Gains (Instant) 0 0
Available-for-sale Securities, Gross Unrealized Losses (Instant) 0 (51)
Estimated Fair Value 179,957 322,121
Mortgage-Backed Securities [Member]    
Available-for-sale securities    
Amortized Cost 866,048 1,186,732
Available-for-sale Securities, Gross Unrealized Gains (Instant) 660 3,527
Available-for-sale Securities, Gross Unrealized Losses (Instant) (22,311) (14,757)
Estimated Fair Value 844,397 1,175,502
Asset-backed Securities [Member]    
Available-for-sale securities    
Amortized Cost 92,751 220,033
Available-for-sale Securities, Gross Unrealized Gains (Instant) 16 404
Available-for-sale Securities, Gross Unrealized Losses (Instant) (1,378) (686)
Estimated Fair Value 91,389 219,751
Debt Mutual Fund [Member]    
Available-for-sale securities    
Amortized Cost 101,350 101,350
Available-for-sale Securities, Gross Unrealized Gains (Instant) 0 0
Available-for-sale Securities, Gross Unrealized Losses (Instant) (11,680) (12,674)
Estimated Fair Value 89,670 88,676
Bank Loans [Member]    
Available-for-sale securities    
Amortized Cost 0 153,281
Available-for-sale Securities, Gross Unrealized Gains (Instant) 0 839
Available-for-sale Securities, Gross Unrealized Losses (Instant) 0 (106)
Estimated Fair Value 0 154,014
Commercial Mortgage Backed Securities [Member]    
Available-for-sale securities    
Amortized Cost 156,296 221,504
Available-for-sale Securities, Gross Unrealized Gains (Instant) 1 146
Available-for-sale Securities, Gross Unrealized Losses (Instant) (3,427) (3,679)
Estimated Fair Value $ 152,870 $ 217,971