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Credit Arrangements (Narrative) (Details) - USD ($)
6 Months Ended
Sep. 08, 2021
Aug. 28, 2020
Dec. 31, 2021
Wells Fargo Bank N.A. [Member]      
Short-term Debt [Line Items]      
Debt term 5 years    
Letters of credit outstanding     $ 1,200,000
Secured Credit Agreement [Member]      
Short-term Debt [Line Items]      
Credit agreement capacity   $ 25,000,000.0  
Line of credit outstanding     $ 59,700,000
Debt term     2 years
Letters of credit outstanding $ 1,200,000    
Fixed coverage ratio 100.00%    
Secured Credit Agreement [Member] | Minimum [Member]      
Short-term Debt [Line Items]      
Interest rate under prime rate   3.00%  
Secured Credit Agreement [Member] | Libor Plus 1 [Member]      
Short-term Debt [Line Items]      
Basis spread on interest rate   1.50%  
Interest rate at period end     1.35%
Secured Credit Agreement [Member] | Libor Plus 1 [Member] | Minimum [Member]      
Short-term Debt [Line Items]      
Interest rate under prime rate 1.25%    
Secured Credit Agreement [Member] | Libor Plus 1 [Member] | Maximum [Member]      
Short-term Debt [Line Items]      
Interest rate under prime rate 1.50%    
Secured Credit Agreement [Member] | Wells Fargo Bank N.A. [Member]      
Short-term Debt [Line Items]      
Credit agreement capacity $ 85,000,000    
Secured Credit Agreement [Member] | Wells Fargo Bank N.A. [Member] | Letter Of Credit [Member] | Maximum [Member]      
Short-term Debt [Line Items]      
Minimum working capital required to be maintained under covenant $ 5,000,000