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Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Nov. 24, 2018
Nov. 25, 2017
Nov. 24, 2018
Nov. 25, 2017
Summary Of Significant Accounting Policies [Line Items]        
Revenue $ 188,799 $ 156,738 $ 367,357 $ 297,924
Stock options vesting period     4 years  
Reimbursements [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Revenue $ 3,200 $ 2,900 $ 6,500 $ 5,500
Conversion Fees [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Revenue percentage 0.40% 0.40% 0.50% 0.40%
Permanent Placement Fees [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Revenue percentage 0.60% 0.20% 0.60% 0.10%
Stock Incentive Plan 2014 [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Stock options vesting period     4 years