Acquisition of Cheddar's Scratch Kitchen (Allocation of Purchase Price) (Details) - USD ($) $ in Millions	Feb. 25, 2018	May 28, 2017	Apr. 24, 2017
Business Acquisition [Line Items]
Goodwill	$ 1,182.0	$ 1,201.7
Cheddar's Scratch Kitchen
Business Acquisition [Line Items]
Current assets	47.7
Land, buildings and equipment	214.5
Trademark	375.0
Other assets	22.6
Goodwill	298.5
Total assets acquired	958.3
Current liabilities	51.3
Other liabilities	107.2
Total liabilities assumed	158.5
Net assets acquired	799.8
Preliminary | Cheddar's Scratch Kitchen
Business Acquisition [Line Items]
Current assets			$ 48.2
Land, buildings and equipment			191.9
Trademark			375.0
Other assets			2.2
Goodwill			329.4
Total assets acquired			946.7
Current liabilities			43.4
Other liabilities			104.3
Total liabilities assumed			147.7
Net assets acquired			$ 799.0
Adjustments | Cheddar's Scratch Kitchen
Business Acquisition [Line Items]
Current assets	(0.5)
Land, buildings and equipment	22.6
Trademark	0.0
Other assets	20.4
Goodwill	(30.9)
Total assets acquired	11.6
Current liabilities	7.9
Other liabilities	2.9
Total liabilities assumed	10.8
Net assets acquired	$ 0.8