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Investment Securities (Schedule Of Investment Securities) (Details) - USD ($)
$ in Thousands
Nov. 28, 2015
May. 30, 2015
Current Assets [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 405,667 $ 249,896
Gains in Accumulated Other Comprehensive Income 250 116
Losses in Accumulated Other Comprehensive Income 616 51
Investment securities 405,301 249,961
Noncurrent Assets [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,197 1,199
Gains in Accumulated Other Comprehensive Income $ 521 $ 548
Losses in Accumulated Other Comprehensive Income
Investment securities $ 1,718 $ 1,747
US Government Obligations [Member] | Current Assets [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 29,373 9,609
Gains in Accumulated Other Comprehensive Income $ 21
Losses in Accumulated Other Comprehensive Income $ 37
Investment securities 29,336 $ 9,630
State Municipal Bonds [Member] | Current Assets [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 80,814 76,228
Gains in Accumulated Other Comprehensive Income $ 250 $ 83
Losses in Accumulated Other Comprehensive Income
Investment securities $ 81,064 $ 76,311
Certificates Of Deposit [Member] | Current Assets [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   2,001
Gains in Accumulated Other Comprehensive Income   $ 1
Losses in Accumulated Other Comprehensive Income  
Investment securities   $ 2,002
Commercial Paper [Member] | Current Assets [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 999 7,491
Gains in Accumulated Other Comprehensive Income $ 5
Losses in Accumulated Other Comprehensive Income
Investment securities $ 999 $ 7,496
Corporate Bonds [Member] | Current Assets [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 262,327 $ 136,411
Gains in Accumulated Other Comprehensive Income
Losses in Accumulated Other Comprehensive Income $ 518 $ 47
Investment securities 261,809 136,364
Foreign Government Obligations [Member] | Current Assets [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 2,068 1,042
Gains in Accumulated Other Comprehensive Income $ 3
Losses in Accumulated Other Comprehensive Income $ 9
Investment securities 2,059 $ 1,045
Asset Backed Securities [Member] | Current Assets [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 26,525 $ 14,356
Gains in Accumulated Other Comprehensive Income
Losses in Accumulated Other Comprehensive Income $ 52 $ 4
Investment securities 26,473 14,352
Mutual Funds [Member] | Current Assets [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 3,561 2,758
Gains in Accumulated Other Comprehensive Income $ 3
Losses in Accumulated Other Comprehensive Income
Investment securities $ 3,561 $ 2,761
Mutual Funds [Member] | Noncurrent Assets [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,197 1,199
Gains in Accumulated Other Comprehensive Income $ 521 $ 548
Losses in Accumulated Other Comprehensive Income
Investment securities $ 1,718 $ 1,747