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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Jan. 31, 2015
Jan. 25, 2014
Jan. 31, 2015
Jan. 25, 2014
Income Statement [Abstract]        
Net sales $ 118,123us-gaap_SalesRevenueNet $ 115,369us-gaap_SalesRevenueNet $ 457,856us-gaap_SalesRevenueNet $ 415,730us-gaap_SalesRevenueNet
Cost of goods sold 93,061us-gaap_CostOfRevenue 86,280us-gaap_CostOfRevenue 348,514us-gaap_CostOfRevenue 307,774us-gaap_CostOfRevenue
Gross profit 25,062us-gaap_GrossProfit 29,089us-gaap_GrossProfit 109,342us-gaap_GrossProfit 107,956us-gaap_GrossProfit
Operating expenses:        
Selling expense 13,694us-gaap_SellingExpense 13,188us-gaap_SellingExpense 43,405us-gaap_SellingExpense 40,110us-gaap_SellingExpense
General and administrative 7,133us-gaap_GeneralAndAdministrativeExpense 6,685us-gaap_GeneralAndAdministrativeExpense 22,890us-gaap_GeneralAndAdministrativeExpense 20,788us-gaap_GeneralAndAdministrativeExpense
Product design and development 5,820us-gaap_ResearchAndDevelopmentExpense 5,649us-gaap_ResearchAndDevelopmentExpense 18,773us-gaap_ResearchAndDevelopmentExpense 17,330us-gaap_ResearchAndDevelopmentExpense
Total operating expenses 26,647us-gaap_OperatingExpenses 25,522us-gaap_OperatingExpenses 85,068us-gaap_OperatingExpenses 78,228us-gaap_OperatingExpenses
Operating (loss) income (1,585)us-gaap_OperatingIncomeLoss 3,567us-gaap_OperatingIncomeLoss 24,274us-gaap_OperatingIncomeLoss 29,728us-gaap_OperatingIncomeLoss
Nonoperating income (expense):        
Interest income 250us-gaap_InvestmentIncomeNet 290us-gaap_InvestmentIncomeNet 825us-gaap_InvestmentIncomeNet 945us-gaap_InvestmentIncomeNet
Interest expense (59)us-gaap_InterestExpense (62)us-gaap_InterestExpense (183)us-gaap_InterestExpense (189)us-gaap_InterestExpense
Other income (expense), net 179us-gaap_OtherNonoperatingIncomeExpense (237)us-gaap_OtherNonoperatingIncomeExpense (218)us-gaap_OtherNonoperatingIncomeExpense (351)us-gaap_OtherNonoperatingIncomeExpense
(Loss) income before income taxes (1,215)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 3,558us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 24,698us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 30,133us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax (benefit) expense (1,776)us-gaap_IncomeTaxExpenseBenefit 687us-gaap_IncomeTaxExpenseBenefit 7,655us-gaap_IncomeTaxExpenseBenefit 9,753us-gaap_IncomeTaxExpenseBenefit
Net income $ 561us-gaap_NetIncomeLoss $ 2,871us-gaap_NetIncomeLoss $ 17,043us-gaap_NetIncomeLoss $ 20,380us-gaap_NetIncomeLoss
Weighted average shares outstanding:        
Basic (in shares) 43,612us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 43,039us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 43,435us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 42,772us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) 43,991us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 43,613us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 44,204us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 43,397us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings per share:        
Basic (in dollars per share) $ 0.01us-gaap_EarningsPerShareBasic $ 0.07us-gaap_EarningsPerShareBasic $ 0.39us-gaap_EarningsPerShareBasic $ 0.48us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) $ 0.01us-gaap_EarningsPerShareDiluted $ 0.07us-gaap_EarningsPerShareDiluted $ 0.39us-gaap_EarningsPerShareDiluted $ 0.47us-gaap_EarningsPerShareDiluted
Cash dividend declared per share (in dollars per share) $ 0.100us-gaap_CommonStockDividendsPerShareDeclared $ 0.090us-gaap_CommonStockDividendsPerShareDeclared $ 0.300us-gaap_CommonStockDividendsPerShareDeclared $ 0.300us-gaap_CommonStockDividendsPerShareDeclared