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Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Detail) - Summary of fair value of assets and liabilities measure on recurring basis: (USD $) In Thousands, unless otherwise specified	Nov. 25, 2012	May 27, 2012	Apr. 23, 2012
Investment in private company	$ 26,752	$ 21,500
Contingent consideration			(3,933)
Fair Value at November 25, 2012 [Member] | Fair Value, Inputs, Level 1 [Member]
Marketable securities	1,959
Total	1,959
Fair Value at November 25, 2012 [Member] | Fair Value, Inputs, Level 2 [Member]
Interest rate swap	248
Total	248
Fair Value at November 25, 2012 [Member] | Fair Value, Inputs, Level 3 [Member]
Investment in private company	26,752
Total	26,752
Fair Value at May 27, 2012 [Member] | Fair Value, Inputs, Level 2 [Member]
Interest rate swap		347
Total		347
Fair Value at May 27, 2012 [Member] | Fair Value, Inputs, Level 3 [Member]
Investment in private company		21,500
Total		21,500
Contingent consideration		3,933
Total		$ 3,933

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