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Other Gains and Charges - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 27, 2019
Mar. 28, 2018
Dec. 27, 2017
Sep. 27, 2017
Mar. 27, 2019
Mar. 28, 2018
Mar. 27, 2019
Restructuring Cost and Reserve [Line Items]              
(Gain) on sale of assets, net $ (6.0) $ 0.0     $ (6.8) $ (0.3)  
Sale leaseback transaction, current period gain recognized (4.7)       (29.4)    
Sale leaseback transaction charges 0.4       7.4    
Foreign currency transaction (gain) loss (0.5) (1.0)     (0.6) (0.1)  
Corporate headquarters relocation charges 5.2 0.0     5.2 0.0  
Remodel-related costs 1.7 0.0     4.8 0.0  
Restaurant closure charges 0.2 2.8     4.0 7.3  
Restaurant impairment charges 0.0 0.0 $ 2.0 $ 7.2 1.0 9.2  
Accelerated depreciation 0.0 0.5     1.0 1.5  
Property damage insurance proceeds   (0.5)       (1.0)  
Business interruption insurance recoveries   (0.4)          
Property damages, net of (insurance recoveries) 0.1 0.3     (0.5) 5.4  
Cyber security incident charges 0.0 0.0     0.4 0.0 $ 4.1
Lease guarantee charges 0.0 0.5     0.0 1.9  
Proceeds from sale of JV     18.0        
Gain on disposal of JV     $ 0.2        
CorporateHeadquarters [Member]              
Restructuring Cost and Reserve [Line Items]              
(Gain) on sale of assets, net $ (5.8)            
Discontinued Operations, Disposed of by Sale [Member]              
Restructuring Cost and Reserve [Line Items]              
Restaurant closure charges   1.7          
Facility Closing [Member]              
Restructuring Cost and Reserve [Line Items]              
Restaurant closure charges   $ 1.1       4.3  
Land [Member]              
Restructuring Cost and Reserve [Line Items]              
(Gain) on sale of assets, net         $ (0.8)    
Hurricane [Member]              
Restructuring Cost and Reserve [Line Items]              
Property damages, net of (insurance recoveries)           $ (0.1)