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Note 11 Earnings Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Earnings Per Share [Line Items]    
Net income $ 22,656us-gaap_NetIncomeLoss $ 23,101us-gaap_NetIncomeLoss
Weighted average shares used in computing per share amount:    
Weighted average common shares outstanding 82,548us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 83,766us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive stock options and restricted stock units 4,134us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 3,493us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Denominator for diluted earnings per share 86,682us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 87,259us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income per share:    
Basic $ 0.27us-gaap_EarningsPerShareBasic $ 0.28us-gaap_EarningsPerShareBasic
Diluted $ 0.26us-gaap_EarningsPerShareDiluted $ 0.26us-gaap_EarningsPerShareDiluted
Potentially dilutive securities [Abstract]    
Potentially dilutive securities 472us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 3,268us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Employee stock options    
Potentially dilutive securities [Abstract]    
Potentially dilutive securities 399us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
3,220us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
Restricted stock units    
Potentially dilutive securities [Abstract]    
Potentially dilutive securities 73us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockUnitsRSUMember
48us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockUnitsRSUMember