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Condensed Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 28, 2014	Mar. 29, 2013	Mar. 28, 2014	Mar. 29, 2013
Net sales	$ 124,273us-gaap_SalesRevenueNet	$ 132,100us-gaap_SalesRevenueNet	$ 203,373us-gaap_SalesRevenueNet	$ 219,374us-gaap_SalesRevenueNet
Cost of sales	75,427us-gaap_CostOfGoodsSold	78,016us-gaap_CostOfGoodsSold	124,598us-gaap_CostOfGoodsSold	131,476us-gaap_CostOfGoodsSold
Gross profit	48,846us-gaap_GrossProfit	54,084us-gaap_GrossProfit	78,775us-gaap_GrossProfit	87,898us-gaap_GrossProfit
Operating expenses:
Marketing and selling	23,938us-gaap_SellingAndMarketingExpense	25,876us-gaap_SellingAndMarketingExpense	42,910us-gaap_SellingAndMarketingExpense	45,094us-gaap_SellingAndMarketingExpense
Administrative management, finance and information systems	9,513us-gaap_GeneralAndAdministrativeExpense	11,500us-gaap_GeneralAndAdministrativeExpense	19,531us-gaap_GeneralAndAdministrativeExpense	20,945us-gaap_GeneralAndAdministrativeExpense
Research and development	3,849us-gaap_ResearchAndDevelopmentExpense	4,070us-gaap_ResearchAndDevelopmentExpense	7,696us-gaap_ResearchAndDevelopmentExpense	7,695us-gaap_ResearchAndDevelopmentExpense
Total operating expenses	37,300us-gaap_OperatingExpenses	41,446us-gaap_OperatingExpenses	70,137us-gaap_OperatingExpenses	73,734us-gaap_OperatingExpenses
Operating profit	11,546us-gaap_OperatingIncomeLoss	12,638us-gaap_OperatingIncomeLoss	8,638us-gaap_OperatingIncomeLoss	14,164us-gaap_OperatingIncomeLoss
Interest income	(5)us-gaap_InvestmentIncomeNet	(32)us-gaap_InvestmentIncomeNet	(36)us-gaap_InvestmentIncomeNet	(53)us-gaap_InvestmentIncomeNet
Interest expense	313us-gaap_InterestExpense	485us-gaap_InterestExpense	515us-gaap_InterestExpense	924us-gaap_InterestExpense
Other expense (income), net	24us-gaap_OtherNonoperatingIncomeExpense	(878)us-gaap_OtherNonoperatingIncomeExpense	(135)us-gaap_OtherNonoperatingIncomeExpense	(380)us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes	11,214us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	13,063us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	8,294us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	13,673us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense	3,810us-gaap_IncomeTaxExpenseBenefit	4,126us-gaap_IncomeTaxExpenseBenefit	3,083us-gaap_IncomeTaxExpenseBenefit	4,489us-gaap_IncomeTaxExpenseBenefit
Net income	$ 7,404us-gaap_NetIncomeLoss	$ 8,937us-gaap_NetIncomeLoss	$ 5,211us-gaap_NetIncomeLoss	$ 9,184us-gaap_NetIncomeLoss
Dilutive stock options and restricted stock units	6us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	4us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	2us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	3us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average common shares - Dilutive	9,649us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	9,546us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	9,611us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	9,491us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Class A [Member]
Weighted average common shares - Basic:
Weighted average common shares - Basic	8,431us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementScenarioAxis = us-gaap_CommonClassAMember	8,328us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementScenarioAxis = us-gaap_CommonClassAMember	8,397us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementScenarioAxis = us-gaap_CommonClassAMember	8,274us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementScenarioAxis = us-gaap_CommonClassAMember
Net (loss) income per common share - Basic:
Net (loss) income per common share - Basic	$ 0.75us-gaap_EarningsPerShareBasic / us-gaap_StatementScenarioAxis = us-gaap_CommonClassAMember	$ 0.91us-gaap_EarningsPerShareBasic / us-gaap_StatementScenarioAxis = us-gaap_CommonClassAMember	$ 0.53us-gaap_EarningsPerShareBasic / us-gaap_StatementScenarioAxis = us-gaap_CommonClassAMember	$ 0.94us-gaap_EarningsPerShareBasic / us-gaap_StatementScenarioAxis = us-gaap_CommonClassAMember
Net (loss) income per common share - Diluted:
Net (loss) income per common share - Diluted	$ 0.74us-gaap_EarningsPerShareDiluted / us-gaap_StatementScenarioAxis = us-gaap_CommonClassAMember	$ 0.90us-gaap_EarningsPerShareDiluted / us-gaap_StatementScenarioAxis = us-gaap_CommonClassAMember	$ 0.52us-gaap_EarningsPerShareDiluted / us-gaap_StatementScenarioAxis = us-gaap_CommonClassAMember	$ 0.93us-gaap_EarningsPerShareDiluted / us-gaap_StatementScenarioAxis = us-gaap_CommonClassAMember
Dividends Per Common Share
Dividends Per Common Share	$ 0.08us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementScenarioAxis = us-gaap_CommonClassAMember		$ 0.23us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementScenarioAxis = us-gaap_CommonClassAMember
Class B [Member]
Weighted average common shares - Basic:
Weighted average common shares - Basic	1,212us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementScenarioAxis = us-gaap_CommonClassBMember	1,214us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementScenarioAxis = us-gaap_CommonClassBMember	1,212us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementScenarioAxis = us-gaap_CommonClassBMember	1,214us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementScenarioAxis = us-gaap_CommonClassBMember
Net (loss) income per common share - Basic:
Net (loss) income per common share - Basic	$ 0.68us-gaap_EarningsPerShareBasic / us-gaap_StatementScenarioAxis = us-gaap_CommonClassBMember	$ 0.83us-gaap_EarningsPerShareBasic / us-gaap_StatementScenarioAxis = us-gaap_CommonClassBMember	$ 0.48us-gaap_EarningsPerShareBasic / us-gaap_StatementScenarioAxis = us-gaap_CommonClassBMember	$ 0.85us-gaap_EarningsPerShareBasic / us-gaap_StatementScenarioAxis = us-gaap_CommonClassBMember
Net (loss) income per common share - Diluted:
Net (loss) income per common share - Diluted	$ 0.74us-gaap_EarningsPerShareDiluted / us-gaap_StatementScenarioAxis = us-gaap_CommonClassBMember	$ 0.90us-gaap_EarningsPerShareDiluted / us-gaap_StatementScenarioAxis = us-gaap_CommonClassBMember	$ 0.52us-gaap_EarningsPerShareDiluted / us-gaap_StatementScenarioAxis = us-gaap_CommonClassBMember	$ 0.93us-gaap_EarningsPerShareDiluted / us-gaap_StatementScenarioAxis = us-gaap_CommonClassBMember
Dividends Per Common Share
Dividends Per Common Share	$ 0.07us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementScenarioAxis = us-gaap_CommonClassBMember		$ 0.20us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementScenarioAxis = us-gaap_CommonClassBMember

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