Fair Value Measurements (Narrative) (Details) - USD ($)	6 Months Ended	12 Months Ended
	Nov. 25, 2018	May 27, 2018
Impaired Long-Lived Assets Held and Used [Line Items]
Carrying value of long-term debt	$ 927,100,000	$ 926,500,000
Fair value of long-term debt	891,700,000	922,000,000
Long-lived assets	2,521,100,000	2,429,800,000
Impairment of long-lived assets	2,500,000	3,700,000
Significant unobservable inputs (Level 3) | Carrying Value
Impaired Long-Lived Assets Held and Used [Line Items]
Long-lived assets	2,800,000	3,700,000
Significant unobservable inputs (Level 3) | Fair Value
Impaired Long-Lived Assets Held and Used [Line Items]
Long-lived assets	$ 300,000	$ 0