Available-For-Sale Securities (Schedule Of Available-For-Sale Securities Classified As Current Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 01, 2014		Jun. 01, 2013
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	$ 176,667
Current Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	174,987		157,847
Gains in Accumulated Other Comprehensive Income	274		81
Losses in Accumulated Other Comprehensive Income			24
Estimated Fair Value	175,261		157,904
Noncurrent Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	993		721
Gains in Accumulated Other Comprehensive Income	413		305
Estimated Fair Value	1,406		1,026
State Municipal Bonds [Member] | Current Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	69,328		61,124
Gains in Accumulated Other Comprehensive Income	160		71
Estimated Fair Value	69,488		61,195
US Government Obligations [Member] | Current Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,057		12,378
Gains in Accumulated Other Comprehensive Income	3
Losses in Accumulated Other Comprehensive Income			1
Estimated Fair Value	4,060		12,377
Corporate Bonds [Member] | Current Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	82,255		64,406
Gains in Accumulated Other Comprehensive Income	103
Losses in Accumulated Other Comprehensive Income			23
Estimated Fair Value	82,358		64,383
Commercial Paper [Member] | Current Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,696
Gains in Accumulated Other Comprehensive Income	1
Estimated Fair Value	9,697
Certificates Of Deposit [Member] | Current Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,837		12,280
Gains in Accumulated Other Comprehensive Income	1		5
Estimated Fair Value	1,838		12,285
Variable Rate Demand Notes [Member] | Current Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,000
Estimated Fair Value	2,000
Government Agency Bonds [Member] | Current Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,814		7,659
Gains in Accumulated Other Comprehensive Income	6		5
Estimated Fair Value	5,820		7,664
Mutual Funds [Member] | Noncurrent Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	993	[1]	721	[1]
Gains in Accumulated Other Comprehensive Income	413	[1]	305	[1]
Estimated Fair Value	$ 1,406	[1]	$ 1,026	[1]

[1] The mutual funds are classified as long term and are a part of “other investments” in the Condensed Consolidated Balance Sheet.