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Supplemental Disclosure Of Cash Flow Information (Schedule Of Additional Information Regarding Cash Flows) (Details) - USD ($) shares in Thousands, $ in Thousands	9 Months Ended
	Feb. 22, 2020	Feb. 23, 2019
Business Acquisition [Line Items]
Income taxes paid	$ 8,163	$ 11,640
Interest paid	1,669	1,878
Capitalized leasehold improvements paid directly by landlord	$ 59	1,211
Issuance of common stock	1,141
Dividends declared, not paid	$ 4,501	4,147
Veracity [Member]
Business Acquisition [Line Items]
Liability for contingent consideration	5,580
Taskforce [Member]
Business Acquisition [Line Items]
Liability for contingent consideration	1,840	$ 4,202
Expertence [Member]
Business Acquisition [Line Items]
Liability for contingent consideration	$ 302

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