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Note 6 - Goodwill and Other Identifiable Intangible Assets (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 25, 2024
Feb. 26, 2023
Aug. 28, 2022
Feb. 25, 2024
Feb. 26, 2023
Goodwill, Impairment Loss       $ 20.7 $ 141.7
Finite-Lived Intangible Assets, Remaining Amortization Period (Year) 18 years     18 years  
Amortization of Intangible Assets $ 13.4 $ 13.8   $ 40.2 $ 43.3
Finite-Lived Intangible Asset, Expected Amortization, Year One 44.8     44.8  
Finite-Lived Intangible Asset, Expected Amortization, Year Two 44.8     44.8  
Finite-Lived Intangible Asset, Expected Amortization, Year Three 44.8     44.8  
Finite-Lived Intangible Asset, Expected Amortization, Year Four 44.8     44.8  
Finite-Lived Intangible Asset, Expected Amortization, Year Five $ 44.8     $ 44.8  
Selling, General and Administrative Expenses [Member] | Refrigerated And Frozen [Member]          
Goodwill, Impairment Loss     $ 141.7    
Selling, General and Administrative Expenses [Member] | Refrigerated And Frozen [Member] | Trade Names [Member]          
Impairment of Intangible Assets, Indefinite-Lived (Excluding Goodwill)     $ 244.0