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Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Feb. 23, 2019
Feb. 24, 2018
Feb. 23, 2019
Feb. 24, 2018
Summary Of Significant Accounting Policies [Line Items]        
Revenue $ 179,498 $ 172,414 $ 546,855 $ 470,338
Stock options vesting period     4 years  
Reimbursements [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Revenue $ 2,700 $ 2,900 $ 9,200 $ 8,400
Conversion Fees [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Revenue percentage 0.60% 0.40% 0.50% 0.40%
Permanent Placement Fees [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Revenue percentage 0.50% 0.50% 0.60% 0.30%
Stock Incentive Plan 2014 [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Stock options vesting period     4 years