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Indebtedness (Details)
$ in Millions
9 Months Ended
Jul. 08, 2018
USD ($)
Mar. 21, 2018
Mar. 20, 2018
Debt Instrument [Line Items]      
Derivative, Floor Interest Rate 0.00%    
Line of Credit Facility, Interest Rate at Period End 2.00%    
Letters of Credit Outstanding, Amount $ 31.4    
Maximum Leverage Ratio   4.5 4.0
Pro Forma Leverage Ratio 4.0    
Debt Instrument, Periodic Payment, Principal $ 10.7    
Line of Credit Facility, Expiration Date Mar. 01, 2020    
Term Loan [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Fair Value of Amount Outstanding $ 347.0    
Repayments of Debt 260.0    
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Fair Value of Amount Outstanding 645.7    
Line of Credit Facility, Current Borrowing Capacity $ 900.0    
Minimum [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 1.25%    
Maximum [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 2.25%    
Qdoba | Term Loan [Member]      
Debt Instrument [Line Items]      
Repayments of Debt $ 260.0