Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies (Details) - Revenue Arrangements (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	May 25, 2014	Feb. 23, 2014	Nov. 24, 2013	Aug. 25, 2013	May 26, 2013	Feb. 24, 2013	Nov. 25, 2012	Aug. 26, 2012	May 27, 2012	Feb. 26, 2012	Nov. 27, 2011	Aug. 28, 2011	May 25, 2014	May 26, 2013	May 27, 2012
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Revenue	$ 120,929	$ 126,379	$ 120,026	$ 109,479	$ 107,113	$ 117,867	$ 114,654	$ 102,074	$ 82,617	$ 80,064	$ 81,570	$ 73,301	$ 476,813	$ 441,708	$ 317,552
Revenue Recorded Upon Shipment [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Revenue													398,938	359,518
Revenue Recorded Upon Acceptance in Foreign Port [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Revenue													69,710	78,442
Revenue from License Fees, R&D Contracts and Royalties/Profit Sharing [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Revenue													1,354	1,975
Revenue from Multiple Element Arrangements [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Revenue													$ 6,811	$ 1,773