Note 8. Commitments and Contingencies (Details) - Anticipated Payments and Insurance Proceeds of Identified Environmental Remediation Liabilities (USD $) In Thousands, unless otherwise specified	May 25, 2013
Anticipated Payments and Insurance Proceeds of Identified Environmental Remediation Liabilities [Abstract]
Estimated costs – current dollars	$ 3,785
Estimated costs – current dollars	2,470
Estimated costs – current dollars	1,437
Estimated costs – current dollars	950
Estimated costs – current dollars	752
Estimated costs – current dollars	11,861
Estimated costs – current dollars	21,255
Estimated insurance proceeds	0
Estimated insurance proceeds	(173)
Estimated insurance proceeds	(159)
Estimated insurance proceeds	(173)
Estimated insurance proceeds	(159)
Estimated insurance proceeds	(1,743)
Estimated insurance proceeds	(2,407)
Net anticipated costs	3,785
Net anticipated costs	2,297
Net anticipated costs	1,278
Net anticipated costs	777
Net anticipated costs	593
Net anticipated costs	10,118
Net anticipated costs	18,848
Effect of inflation	7,109
Effect of discounting	(7,547)
Balance as of May 25, 2013	$ 18,410