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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. 24, 2013
Feb. 26, 2012
Feb. 24, 2013
Feb. 26, 2012
Product sales $ 117,584,000 $ 79,519,000 $ 332,977,000 $ 232,605,000
Services revenue, related party 283,000 545,000 1,618,000 2,330,000
Total revenues 117,867,000 80,064,000 334,595,000 234,935,000
Cost of product sales 100,090,000 66,432,000 283,461,000 195,596,000
Cost of services revenue 269,000 460,000 1,404,000 1,907,000
Total cost of revenue 100,359,000 66,892,000 284,865,000 197,503,000
Gross profit 17,508,000 13,172,000 49,730,000 37,432,000
Research and development 2,325,000 2,473,000 6,642,000 7,142,000
Selling, general and administrative 8,524,000 6,664,000 26,266,000 19,172,000
Change in value of contingent consideration     (3,933,000)  
Total operating costs and expenses 10,849,000 9,137,000 28,975,000 26,314,000
Operating income 6,659,000 4,035,000 20,755,000 11,118,000
Dividend income 281,000 281,000 844,000 844,000
Interest income 46,000 63,000 104,000 219,000
Interest expense (487,000) (153,000) (1,526,000) (492,000)
Other income 1,047,000 3,508,000 6,288,000 4,595,000
Net income before taxes 7,546,000 7,734,000 26,465,000 16,284,000
Income tax expense (2,754,000) (2,920,000) (8,238,000) (6,079,000)
Consolidated net income 4,792,000 4,814,000 18,227,000 10,205,000
Non controlling interest (3,000) (49,000) (159,000) (288,000)
Net income applicable to Common Stockholders 4,789,000 4,765,000 18,068,000 9,917,000
Basic net income per share (in Dollars per share) $ 0.19 $ 0.19 $ 0.70 $ 0.38
Diluted net income per share (in Dollars per share) $ 0.18 $ 0.18 $ 0.68 $ 0.38
Basic (in Shares) 25,839 25,538 25,752 25,944
Diluted (in Shares) 26,667 25,825 26,492 26,205
Interest rate swap   53,000   100,000
Income tax expense   (20,000)   (35,000)
Other comprehensive income, net of tax   33,000   65,000
Comprehensive income attributable to Common Stockholders $ 4,789,000 $ 4,798,000 $ 18,068,000 $ 9,982,000