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Long-Term Debt - Narrative (Details)
$ in Millions
3 Months Ended
Aug. 01, 2017
Mar. 31, 2018
USD ($)
Revolving Credit Facility    
Debt Instrument [Line Items]    
Debt instrument, unused borrowing capacity, amount   $ 1,270.0
Covenant through June 30, 2018 | Amended and Restated Competitive Advance and Revolving Credit Agreement    
Debt Instrument [Line Items]    
Covenant requirement, maximum total leverage ratio 5.0  
Covenant through June 30, 2019 | Amended and Restated Competitive Advance and Revolving Credit Agreement    
Debt Instrument [Line Items]    
Covenant requirement, maximum total leverage ratio 4.75  
Covenant through June 29, 2020 | Amended and Restated Competitive Advance and Revolving Credit Agreement    
Debt Instrument [Line Items]    
Covenant requirement, maximum total leverage ratio 4.5  
KFMB    
Debt Instrument [Line Items]    
Proceeds from borrowings on revolving credit facility   $ 220.0