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Borrowing Arrangements (Details 2) - Secured debt - USD ($)
$ in Millions
6 Months Ended
Jun. 01, 2018
Dec. 01, 2017
Jun. 01, 2017
Dec. 01, 2016
Jun. 30, 2018
Term loan credit facility          
Amount of senior secured draw term loan credit facility         $ 100.0
Scheduled draws on the credit facility $ 25.0 $ 25.0 $ 25.0 $ 25.0  
Total amount drawn on the credit facility         $ 100.0
Repayment period of credit facility (in years)         28 years
Fixed interest rate of credit facility (as a percent)         4.35%
Quarterly commitment fee on the unused portion of the credit facility (as a percent)         0.08%
Fair value of bonds pledged as collateral on the credit facility         $ 108.3
Estimated fair value of the credit facility         94.3
Principal payments due in 2019         1.9
Principal payments due in 2020         2.0
Principal payments due in 2021         2.0
Principal payments due in 2022         2.1
Principal payments due in 2023         2.2
Principal payments due in 2024 and thereafter         $ 89.8