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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

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-Name Accounting Standards Codification
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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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