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Restructuring Costs - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
May 31, 2020
May 26, 2019
May 27, 2018
Restructuring Cost and Reserve [Line Items]      
Impairment of long-lived assets to be disposed of $ 10,900    
Property and equipment, net 192,338 $ 200,027  
Current portion of lease liabilities 4,423 75  
Long term lease liabilities 26,378 3,532  
Impairment of goodwill and intangible assets 12,953 $ 2,000 $ 0
BreatheWay      
Restructuring Cost and Reserve [Line Items]      
Impairment of goodwill and intangible assets 1,900    
Salad dressing plant in Ontario, CA      
Restructuring Cost and Reserve [Line Items]      
Impairment of long-lived assets to be disposed of 10,900    
Property and equipment, net 2,600    
Current portion of lease liabilities 300    
Long term lease liabilities $ 2,900