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Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies - Revenue Arrangements (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
May 28, 2017
Feb. 26, 2017
Nov. 27, 2016
Aug. 28, 2016
May 29, 2016
Feb. 28, 2016
Nov. 29, 2015
Aug. 30, 2015
May 31, 2015
Mar. 01, 2015
Nov. 30, 2014
Aug. 31, 2014
May 28, 2017
May 29, 2016
May 31, 2015
Revenues $ 127,430 $ 136,568 $ 135,865 $ 132,394 $ 135,313 $ 129,990 $ 140,441 $ 135,355 $ 134,448 $ 138,530 $ 132,665 $ 133,614 $ 532,257 $ 541,099 $ 539,257
Revenue Recorded Upon Shipment [Member]                              
Revenues                         456,512 458,985 465,848
Revenue Recorded Upon Acceptance in Foreign Port [Member]                              
Revenues                         62,481 64,181 67,714
Revenue from Multiple Element Arrangements [Member]                              
Revenues                         8,431 13,400 4,253
Revenue from License Fees, R&D Contracts and Royalties/Profit Sharing [Member]                              
Revenues                         $ 4,833 $ 4,533 $ 1,806