FAIR VALUE MEASUREMENTS (Narrative) (Details) $ in Millions	12 Months Ended
May 29, 2022 USD ($) restaurant	May 30, 2021 USD ($) restaurant
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value of long-term debt	$ 901.0	$ 929.8
Fair value of long-term debt	896.9	1,060.0
Carrying amount of long-lived assets held and used	3,356.0	$ 2,869.2
Number of underperforming restaurants \| restaurant		4
Significant Unobservable Inputs (Level 3) \| Underperforming Restaurants
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying amount of long-lived assets held and used	$ 4.9	$ 5.6
Number of underperforming restaurants \| restaurant	1	4
Assets held-for-sale, long-lived, fair value	$ 0.9	$ 0.6
Asset impairment	$ 4.0	$ 5.0

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