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Investment Securities (Schedule of Investment Securities) (Details) - USD ($)
$ in Thousands
Nov. 26, 2022
May 28, 2022
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost, Current $ 203,390 $ 116,167
Unrealized Gains, Current 0 4
Unrealized Losses, Current 2,676 742
Estimated Fair Value, Current 200,714 115,429
Amortized Cost, Noncurrent 3,472 3,826
Unrealized Gains, Noncurrent 0 0
Unrealized Losses, Noncurrent 114 74
Estimated Fair Value, Noncurrent 3,358 3,752
Municipal Bonds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost, Current 15,956 10,136
Unrealized Gains, Current 0 0
Unrealized Losses, Current 276 32
Estimated Fair Value, Current 15,680 10,104
Commercial Paper [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost, Current 33,058 14,940
Unrealized Gains, Current 0 0
Unrealized Losses, Current 53 72
Estimated Fair Value, Current 33,005 14,868
Corporate Bonds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost, Current 81,218 74,167
Unrealized Gains, Current 0 0
Unrealized Losses, Current 1,709 483
Estimated Fair Value, Current 79,509 73,684
Certificates of Deposits [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost, Current   1,263
Unrealized Gains, Current   0
Unrealized Losses, Current   18
Estimated Fair Value, Current   1,245
US Government and Agency Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost, Current 19,111 2,205
Unrealized Gains, Current 0 4
Unrealized Losses, Current 205 0
Estimated Fair Value, Current 18,906 2,209
Asset Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost, Current 13,403 13,456
Unrealized Gains, Current 0 0
Unrealized Losses, Current 340 137
Estimated Fair Value, Current 13,063 13,319
Treasury Bills [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost, Current 40,644  
Unrealized Gains, Current 0  
Unrealized Losses, Current 93  
Estimated Fair Value, Current 40,551  
Mutual Funds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost, Noncurrent 3,472 3,826
Unrealized Gains, Noncurrent 0 0
Unrealized Losses, Noncurrent 114 74
Estimated Fair Value, Noncurrent $ 3,358 $ 3,752