Intangible Assets And Goodwill (Schedule Of Details Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Aug. 30, 2014	May 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross	$ 22,642	$ 22,859
Accumulated Amortization	(22,046)	(21,828)
Net	596	1,031
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	18,077	18,286
Accumulated Amortization	(17,807)	(17,794)
Net	270	492
Non-compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	3,224	3,232
Accumulated Amortization	(3,079)	(2,937)
Net	145	295
Trade Name And Trademark [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, estimated lives	5 years
Gross	1,341	1,341
Accumulated Amortization	(1,160)	(1,097)
Net	$ 181	$ 244
Minimum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, estimated lives	2 years
Minimum [Member] | Non-compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, estimated lives	1 year
Maximum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, estimated lives	7 years
Maximum [Member] | Trade Name And Trademark [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, estimated lives	5 years