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Debt: Line of Credit (Details) - Line of Credit - USD ($)
$ in Millions
Sep. 26, 2020
Aug. 31, 2020
Line of Credit    
Aggregate commitments $ 25.0 $ 40.0
Maximum amount of additional term notes available for issuance 25.0  
Borrowings outstanding 0.0  
Line of credit available for additional borrowings $ 25.0