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Commitments (Details) - USD ($)
$ in Millions
 12 Months Ended
Feb. 23, 2018
Feb. 24, 2017
Feb. 26, 2016
Long-term Purchase Commitment [Line Items]      
Construction in Progress, Estimated Cost to Complete $ 15.4 $ 21.6  
Deferred Gain on Sale of Property 0.3 1.5  
Operating Leases, Rent Expense, Net 53.7 49.8 $ 48.8
Operating Leases, Rent Expense, Sublease Rentals 4.4 $ 4.0 $ 5.2
Minimum annual rental commitment [Member]      
Long-term Purchase Commitment [Line Items]      
Operating Leases, Future Minimum Payments Due, Next Twelve Months (48.5)    
Operating Leases, Future Minimum Payments, Due in Two Years (41.4)    
Operating Leases, Future Minimum Payments, Due in Three Years (31.1)    
Operating Leases, Future Minimum Payments, Due in Four Years (27.2)    
Operating Leases, Future Minimum Payments, Due in Five Years (20.1)    
Operating Leases, Future Minimum Payments, Due Thereafter (38.8)    
Operating Leases, Future Minimum Payments Due (207.1)    
Minimum annual sublease rental income [Member]      
Long-term Purchase Commitment [Line Items]      
Operating Leases, Future Minimum Payments Due, Next Twelve Months (3.7)    
Operating Leases, Future Minimum Payments, Due in Two Years (3.7)    
Operating Leases, Future Minimum Payments, Due in Three Years (3.3)    
Operating Leases, Future Minimum Payments, Due in Four Years (3.3)    
Operating Leases, Future Minimum Payments, Due in Five Years (2.2)    
Operating Leases, Future Minimum Payments, Due Thereafter (0.8)    
Operating Leases, Future Minimum Payments Due (17.0)    
Minimum annual commitments, net [Member]      
Long-term Purchase Commitment [Line Items]      
Operating Leases, Future Minimum Payments Due, Next Twelve Months (44.8)    
Operating Leases, Future Minimum Payments, Due in Two Years (37.7)    
Operating Leases, Future Minimum Payments, Due in Three Years (27.8)    
Operating Leases, Future Minimum Payments, Due in Four Years (23.9)    
Operating Leases, Future Minimum Payments, Due in Five Years (17.9)    
Operating Leases, Future Minimum Payments, Due Thereafter (38.0)    
Operating Leases, Future Minimum Payments Due $ (190.1)