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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
	Aug. 27, 2017	Aug. 28, 2016
Product sales	$ 123,357	$ 132,394
Revenue Recorded Upon Shipment [Member]
Product sales	113,121	105,588
Revenue Recorded Upon Acceptance in Foreign Port [Member]
Product sales	7,576	23,339
Revenue from Multiple Element Arrangements [Member]
Product sales	1,746	1,585
Revenue from License Fees, R&D Contracts and Royalties/Profit Sharing [Member]
Product sales	$ 914	$ 1,882

X

- Definition

Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(a))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Details

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X

- Details

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- Details

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- Details

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