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Fair Value Measurements (Details)
$ in Millions
Dec. 30, 2017
USD ($)
Reported Value Measurements  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Mortgage $ 97.9
Fair Value, Inputs, Level 2 | Estimate of Fair Value Measurement  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Mortgage $ 1.9