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Debt: Line of Credit (Details) - Line of Credit
$ in Millions
Mar. 28, 2020
USD ($)
Line of Credit  
Borrowings outstanding $ 40.0
Line of credit available for additional borrowings $ 5.0
Minimum  
Line of Credit  
Interest rate (as a percent) 3.25%
Maximum  
Line of Credit  
Interest rate (as a percent) 3.60%