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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 6 Months Ended
Nov. 30, 2014
Nov. 24, 2013
Nov. 30, 2014
Nov. 24, 2013
Revenue $ 132,665,000us-gaap_SalesRevenueGoodsNet $ 120,026,000us-gaap_SalesRevenueGoodsNet $ 266,279,000us-gaap_SalesRevenueGoodsNet $ 229,505,000us-gaap_SalesRevenueGoodsNet
Cost of product sales 116,999,000us-gaap_CostOfGoodsSold 106,292,000us-gaap_CostOfGoodsSold 236,425,000us-gaap_CostOfGoodsSold 203,239,000us-gaap_CostOfGoodsSold
Gross profit 15,666,000us-gaap_GrossProfit 13,734,000us-gaap_GrossProfit 29,854,000us-gaap_GrossProfit 26,266,000us-gaap_GrossProfit
Operating costs and expenses:        
Research and development 1,825,000us-gaap_ResearchAndDevelopmentExpense 1,919,000us-gaap_ResearchAndDevelopmentExpense 3,620,000us-gaap_ResearchAndDevelopmentExpense 3,845,000us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative 9,949,000us-gaap_SellingGeneralAndAdministrativeExpense 8,639,000us-gaap_SellingGeneralAndAdministrativeExpense 18,808,000us-gaap_SellingGeneralAndAdministrativeExpense 17,269,000us-gaap_SellingGeneralAndAdministrativeExpense
Total operating costs and expenses 11,774,000us-gaap_OperatingExpenses 10,558,000us-gaap_OperatingExpenses 22,428,000us-gaap_OperatingExpenses 21,114,000us-gaap_OperatingExpenses
Operating income 3,892,000us-gaap_OperatingIncomeLoss 3,176,000us-gaap_OperatingIncomeLoss 7,426,000us-gaap_OperatingIncomeLoss 5,152,000us-gaap_OperatingIncomeLoss
Dividend income 321,000us-gaap_InvestmentIncomeDividend 281,000us-gaap_InvestmentIncomeDividend 602,000us-gaap_InvestmentIncomeDividend 563,000us-gaap_InvestmentIncomeDividend
Interest income 91,000us-gaap_InvestmentIncomeInterest 46,000us-gaap_InvestmentIncomeInterest 184,000us-gaap_InvestmentIncomeInterest 105,000us-gaap_InvestmentIncomeInterest
Interest expense (472,000)us-gaap_InterestExpense (436,000)us-gaap_InterestExpense (855,000)us-gaap_InterestExpense (867,000)us-gaap_InterestExpense
Other income 1,200,000us-gaap_OtherNonoperatingIncomeExpense 2,300,000us-gaap_OtherNonoperatingIncomeExpense 1,400,000us-gaap_OtherNonoperatingIncomeExpense 7,700,000us-gaap_OtherNonoperatingIncomeExpense
Net income before taxes 5,032,000us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 5,367,000us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 8,757,000us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 12,653,000us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Income tax expense (1,785,000)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax (1,874,000)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax (3,086,000)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax (4,349,000)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax
Consolidated net income 3,247,000us-gaap_ProfitLoss 3,493,000us-gaap_ProfitLoss 5,671,000us-gaap_ProfitLoss 8,304,000us-gaap_ProfitLoss
Non-controlling interest (24,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest (42,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest (95,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest (101,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income and comprehensive income applicable to common stockholders $ 3,223,000us-gaap_ComprehensiveIncomeNetOfTax $ 3,451,000us-gaap_ComprehensiveIncomeNetOfTax $ 5,576,000us-gaap_ComprehensiveIncomeNetOfTax $ 8,203,000us-gaap_ComprehensiveIncomeNetOfTax
Basic net income per share (in dollars per share) $ 0.12us-gaap_EarningsPerShareBasic $ 0.13us-gaap_EarningsPerShareBasic $ 0.21us-gaap_EarningsPerShareBasic $ 0.31us-gaap_EarningsPerShareBasic
Diluted net income per share (in dollars per share) $ 0.12us-gaap_EarningsPerShareDiluted $ 0.13us-gaap_EarningsPerShareDiluted $ 0.20us-gaap_EarningsPerShareDiluted $ 0.30us-gaap_EarningsPerShareDiluted
Earnings Per Share [Abstract]        
Basic (in shares) 26,864us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 26,571us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 26,852us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 26,512us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) 27,314us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 27,070us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 27,293us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 27,081us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding