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Organization, Basis of Presentation, and Summary of Significant Accounting Policies - Contract Assets and Liabilities Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
May 31, 2020
May 26, 2019
Revenue from External Customer [Line Items]    
Deferred revenue $ 352 $ 499
Deferred revenue recognized 200  
Unbilled Revenues    
Revenue from External Customer [Line Items]    
Contract with customer, assets 9,000 5,600
Deferred revenue $ 0 $ 200