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Acquisitions And Dispositions (Summary Of Recognized Amounts Of Assets Acquired And Liabilities Assumed) (Details) - USD ($)
$ in Thousands
9 Months Ended
Feb. 22, 2020
Nov. 30, 2019
May 25, 2019
Feb. 23, 2019
May 26, 2018
Business Acquisition [Line Items]          
Goodwill $ 213,451   $ 190,815 $ 191,149 $ 191,950
Expertence [Member]          
Business Acquisition [Line Items]          
Cash and cash equivalents   $ 11      
Accounts receivable   215      
Prepaid expenses and other current assets   7      
Intangible assets   184      
Total identifiable assets   417      
Accounts payable   196      
Accrued expenses and other current liabilities   8      
Deferred tax liability   59      
Total liabilities assumed   263      
Net identifiable assets acquired   154      
Goodwill   534      
Net assets acquired   $ 688      
Veracity [Member]          
Business Acquisition [Line Items]          
Cash and cash equivalents 2,056        
Accounts receivable 3,299        
Prepaid expenses and other current assets 116        
Property and equipment 117        
Total identifiable assets 16,668        
Accounts payable 305        
Accrued expenses and other current liabilities 712        
Total liabilities assumed 1,017        
Net identifiable assets acquired 15,651        
Goodwill 22,953        
Net assets acquired $ 38,604        
Computer Software [Member]          
Business Acquisition [Line Items]          
Intangible assets, useful lives 2 years        
Computer Software [Member] | Expertence [Member]          
Business Acquisition [Line Items]          
Intangible assets, useful lives 24 years        
Backlog [Member]          
Business Acquisition [Line Items]          
Intangible assets, useful lives 17 months        
Backlog [Member] | Veracity [Member]          
Business Acquisition [Line Items]          
Intangible assets $ 1,210        
Intangible assets, useful lives 17 months        
Customer Relationships [Member]          
Business Acquisition [Line Items]          
Intangible assets, useful lives 7 years        
Customer Relationships [Member] | Veracity [Member]          
Business Acquisition [Line Items]          
Intangible assets $ 9,300        
Trademarks [Member]          
Business Acquisition [Line Items]          
Intangible assets, useful lives 3 years        
Trademarks [Member] | Veracity [Member]          
Business Acquisition [Line Items]          
Intangible assets $ 570