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Organization, Basis of Presentation, and Summary of Significant Accounting Policies - Fair Value of Assets and Liabilities (Details) - USD ($)
Feb. 24, 2019
May 27, 2018
Assets:    
Investment in non-public company $ 68,100,000 $ 66,500,000
Fair Value, Measurements, Recurring | Level 1    
Assets:    
Interest rate swap contracts 0 0
Investment in non-public company 0 0
Total assets 0 0
Interest rate swap contracts    
Interest rate swap contracts 0 0
Contingent consideration liability 0 0
Total liabilities 0 0
Fair Value, Measurements, Recurring | Level 2    
Assets:    
Interest rate swap contracts 992,000 1,529,000
Investment in non-public company 0 0
Total assets 992,000 1,529,000
Interest rate swap contracts    
Interest rate swap contracts 259,000 0
Contingent consideration liability 0 0
Total liabilities 259,000 0
Fair Value, Measurements, Recurring | Level 3    
Assets:    
Interest rate swap contracts 0 0
Investment in non-public company 68,100,000 66,500,000
Total assets 68,100,000 66,500,000
Interest rate swap contracts    
Interest rate swap contracts 0 0
Contingent consideration liability 500,000 4,000,000
Total liabilities $ 500,000 $ 4,000,000