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Financial Instruments (Details 1) (USD $)
In Thousands, unless otherwise specified
Mar. 30, 2013
Mar. 31, 2012
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value $ 792,298 $ 731,520
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (5,180) (1,617)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 39,790 45,218
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (3,347) (3,795)
Available-for-Sale Securities, Fair Value, Total 832,088 776,738
Available-for-Sale Securities, Gross Unrealized Losses, Total (8,527) (5,412)
Commercial Paper [Member]
   
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value   79,994
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses   (1)
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   79,994
Available-for-Sale Securities, Gross Unrealized Losses, Total   (1)
Corporate Bonds [Member]
   
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 27,114 21,111
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (135) (184)
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 27,114 21,111
Available-for-Sale Securities, Gross Unrealized Losses, Total (135) (184)
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 28,701 28,929
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (3,200) (3,671)
Available-for-Sale Securities, Fair Value, Total 28,701 28,929
Available-for-Sale Securities, Gross Unrealized Losses, Total (3,200) (3,671)
Municipal Bonds [Member]
   
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 8,927 2,173
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (70) (24)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 60 366
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses 0 (4)
Available-for-Sale Securities, Fair Value, Total 8,987 2,539
Available-for-Sale Securities, Gross Unrealized Losses, Total (70) (28)
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 388,696 460,735
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (45) (149)
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 388,696 460,735
Available-for-Sale Securities, Gross Unrealized Losses, Total (45) (149)
Mortgage-Backed Securities [Member]
   
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value 367,561 147,726
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses (4,930) (1,040)
Available-for-Sale Securities, 12 Months or Greater, Fair Value 11,029 15,923
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses (147) (120)
Available-for-Sale Securities, Fair Value, Total 378,590 163,649
Available-for-Sale Securities, Gross Unrealized Losses, Total (5,077) (1,160)
Debt Mutual Fund [Member]
   
Fair values and gross unrealized losses of the investments    
Available-for-Sale Securities, Less Than 12 Months, Fair Value   19,781
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses   (219)
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   19,781
Available-for-Sale Securities, Gross Unrealized Losses, Total   $ (219)