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Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Mar. 01, 2015
Feb. 23, 2014
Mar. 01, 2015
Feb. 23, 2014
Revenue $ 138,530us-gaap_SalesRevenueGoodsNet $ 126,379us-gaap_SalesRevenueGoodsNet $ 404,809us-gaap_SalesRevenueGoodsNet $ 355,884us-gaap_SalesRevenueGoodsNet
Cost of product sales 121,645us-gaap_CostOfGoodsSold 106,224us-gaap_CostOfGoodsSold 358,071us-gaap_CostOfGoodsSold 309,463us-gaap_CostOfGoodsSold
Gross profit 16,885us-gaap_GrossProfit 20,155us-gaap_GrossProfit 46,738us-gaap_GrossProfit 46,421us-gaap_GrossProfit
Operating costs and expenses:        
Research and development 1,755us-gaap_ResearchAndDevelopmentExpense 1,723us-gaap_ResearchAndDevelopmentExpense 5,375us-gaap_ResearchAndDevelopmentExpense 5,568us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative 10,298us-gaap_SellingGeneralAndAdministrativeExpense 8,700us-gaap_SellingGeneralAndAdministrativeExpense 29,106us-gaap_SellingGeneralAndAdministrativeExpense 25,969us-gaap_SellingGeneralAndAdministrativeExpense
Total operating costs and expenses 12,053us-gaap_OperatingExpenses 10,423us-gaap_OperatingExpenses 34,481us-gaap_OperatingExpenses 31,537us-gaap_OperatingExpenses
Operating income 4,832us-gaap_OperatingIncomeLoss 9,732us-gaap_OperatingIncomeLoss 12,257us-gaap_OperatingIncomeLoss 14,884us-gaap_OperatingIncomeLoss
Dividend income 413us-gaap_InvestmentIncomeDividend 281us-gaap_InvestmentIncomeDividend 1,015us-gaap_InvestmentIncomeDividend 844us-gaap_InvestmentIncomeDividend
Interest income 85us-gaap_InvestmentIncomeInterest 78us-gaap_InvestmentIncomeInterest 269us-gaap_InvestmentIncomeInterest 183us-gaap_InvestmentIncomeInterest
Interest expense (510)us-gaap_InterestExpense (390)us-gaap_InterestExpense (1,365)us-gaap_InterestExpense (1,257)us-gaap_InterestExpense
Other income 1,307us-gaap_OtherNonoperatingIncomeExpense 400us-gaap_OtherNonoperatingIncomeExpense 2,707us-gaap_OtherNonoperatingIncomeExpense 8,100us-gaap_OtherNonoperatingIncomeExpense
Net income before taxes 6,127us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 10,101us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 14,883us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 22,754us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Income tax expense (2,324)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax (3,679)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax (5,409)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax (8,028)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax
Consolidated net income 3,803us-gaap_ProfitLoss 6,422us-gaap_ProfitLoss 9,474us-gaap_ProfitLoss 14,726us-gaap_ProfitLoss
Non-controlling interest (31)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest (22)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest (126)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest (123)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income and comprehensive income applicable to common stockholders $ 3,772us-gaap_ComprehensiveIncomeNetOfTax $ 6,400us-gaap_ComprehensiveIncomeNetOfTax $ 9,348us-gaap_ComprehensiveIncomeNetOfTax $ 14,603us-gaap_ComprehensiveIncomeNetOfTax
Basic net income per share (in dollars per share) $ 0.14us-gaap_EarningsPerShareBasic $ 0.24us-gaap_EarningsPerShareBasic $ 0.35us-gaap_EarningsPerShareBasic $ 0.55us-gaap_EarningsPerShareBasic
Diluted net income per share (in dollars per share) $ 0.14us-gaap_EarningsPerShareDiluted $ 0.24us-gaap_EarningsPerShareDiluted $ 0.34us-gaap_EarningsPerShareDiluted $ 0.54us-gaap_EarningsPerShareDiluted
Shares used in per share computation        
Basic (in shares) 26,886us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 26,697us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 26,863us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 26,574us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) 27,363us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 27,124us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 27,314us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 27,093us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding