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Investment Securities (Schedule of Investment Securities) (Details) - USD ($)
$ in Thousands
Aug. 27, 2022
May 28, 2022
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost, Current $ 147,622 $ 116,167
Unrealized Gains, Current 0 4
Unrealized Losses, Current 1,838 742
Estimated Fair Value, Current 145,784 115,429
Amortized Cost, Noncurrent 3,467 3,826
Unrealized Gains, Noncurrent 0 0
Unrealized Losses, Noncurrent 130 74
Estimated Fair Value, Noncurrent 3,337 3,752
Municipal Bonds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost, Current 15,032 10,136
Unrealized Gains, Current 0 0
Unrealized Losses, Current 155 32
Estimated Fair Value, Current 14,877 10,104
Commercial Paper [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost, Current 15,936 14,940
Unrealized Gains, Current 0 0
Unrealized Losses, Current 53 72
Estimated Fair Value, Current 15,883 14,868
Corporate Bonds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost, Current 81,711 74,167
Unrealized Gains, Current 0 0
Unrealized Losses, Current 1,237 483
Estimated Fair Value, Current 80,474 73,684
Certificates of Deposits [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost, Current 3,263 1,263
Unrealized Gains, Current 0 0
Unrealized Losses, Current 48 18
Estimated Fair Value, Current 3,215 1,245
US Government and Agency Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost, Current 8,190 2,205
Unrealized Gains, Current 0 4
Unrealized Losses, Current 87 0
Estimated Fair Value, Current 8,103 2,209
Asset Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost, Current 15,620 13,456
Unrealized Gains, Current 0 0
Unrealized Losses, Current 227 137
Estimated Fair Value, Current 15,393 13,319
Treasury Bills [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost, Current 7,870  
Unrealized Gains, Current 0  
Unrealized Losses, Current 31  
Estimated Fair Value, Current 7,839  
Mutual Funds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost, Noncurrent 3,467 3,826
Unrealized Gains, Noncurrent 0 0
Unrealized Losses, Noncurrent 130 74
Estimated Fair Value, Noncurrent $ 3,337 $ 3,752