FAIR VALUE MEASUREMENTS (Narrative) (Details) $ in Millions	12 Months Ended
May 28, 2023 USD ($) restaurant	May 29, 2022 USD ($) restaurant
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value of long-term debt	$ 884.9	$ 901.0
Fair value of long-term debt	857.0	896.9
Carrying amount of long-lived assets held and used	3,725.1	3,356.0
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	$ 10.0	$ 4.9
Number of underperforming restaurants \| restaurant	1	1
Assets held-for-sale, long-lived, fair value	$ 8.4	$ 0.9
Asset impairment	$ 1.6	$ 4.0

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