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Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Feb. 23, 2014
Feb. 24, 2013
Feb. 23, 2014
Feb. 24, 2013
Revenues:        
Product sales $ 126,029,000 $ 117,584,000 $ 354,509,000 $ 332,977,000
Services revenue, related party 350,000 283,000 1,375,000 1,618,000
Total revenues 126,379,000 117,867,000 355,884,000 334,595,000
Cost of revenue:        
Cost of product sales 105,961,000 100,090,000 308,281,000 283,461,000
Cost of services revenue 263,000 269,000 1,182,000 1,404,000
Total cost of revenue 106,224,000 100,359,000 309,463,000 284,865,000
Gross profit 20,155,000 17,508,000 46,421,000 49,730,000
Operating costs and expenses:        
Research and development 1,723,000 2,325,000 5,568,000 6,642,000
Selling, general and administrative 8,700,000 8,524,000 25,969,000 26,266,000
Change in value of contingent consideration       (3,933,000)
Total operating costs and expenses 10,423,000 10,849,000 31,537,000 28,975,000
Operating income 9,732,000 6,659,000 14,884,000 20,755,000
Dividend income 281,000 281,000 844,000 844,000
Interest income 78,000 46,000 183,000 104,000
Interest expense (390,000) (487,000) (1,257,000) (1,526,000)
Other income 400,000 1,047,000 8,100,000 6,288,000
Net income before taxes 10,101,000 7,546,000 22,754,000 26,465,000
Income tax expense (3,679,000) (2,754,000) (8,028,000) (8,238,000)
Consolidated net income 6,422,000 4,792,000 14,726,000 18,227,000
Non controlling interest (22,000) (3,000) (123,000) (159,000)
Net income and comprehensive income applicable to common stockholders $ 6,400,000 $ 4,789,000 $ 14,603,000 $ 18,068,000
Basic net income per share (in Dollars per share) $ 0.24 $ 0.19 $ 0.55 $ 0.70
Diluted net income per share (in Dollars per share) $ 0.24 $ 0.18 $ 0.54 $ 0.68
Shares used in per share computation        
Basic (in Shares) 26,697 25,839 26,574 25,752
Diluted (in Shares) 27,124 26,667 27,093 26,492