Fair Value Measurements (Narrative) (Details) - USD ($)	9 Months Ended	12 Months Ended
	Feb. 24, 2019	May 27, 2018
Impaired Long-Lived Assets Held and Used [Line Items]
Carrying value of long-term debt	$ 927,400,000	$ 926,500,000
Fair value of long-term debt	915,300,000	922,000,000
Long-lived assets	2,539,900,000	2,429,800,000
Three underperforming restaurants
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of long-lived assets	4,500,000
Three underperforming restaurants | Significant unobservable inputs (Level 3) | Carrying Value
Impaired Long-Lived Assets Held and Used [Line Items]
Long-lived assets	5,600,000
Three underperforming restaurants | Significant unobservable inputs (Level 3) | Fair Value
Impaired Long-Lived Assets Held and Used [Line Items]
Long-lived assets	$ 1,100,000
Four underperforming restaurants
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of long-lived assets		3,700,000
Four underperforming restaurants | Significant unobservable inputs (Level 3) | Carrying Value
Impaired Long-Lived Assets Held and Used [Line Items]
Long-lived assets		3,700,000
Four underperforming restaurants | Significant unobservable inputs (Level 3) | Fair Value
Impaired Long-Lived Assets Held and Used [Line Items]
Long-lived assets		$ 0