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Net Income per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Earnings Per Share, Diluted [Line Items]    
Net income attributable to shareholders $ 106,058us-gaap_NetIncomeLoss $ 107,120us-gaap_NetIncomeLoss
Weighted average shares outstanding - basic 95,920us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 99,948us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Net effect of various dilutive stock-based compensation awards 1,205us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 1,451us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average shares outstanding - diluted 97,125us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 101,399us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income per share:    
Basic $ 1.11us-gaap_EarningsPerShareBasic $ 1.07us-gaap_EarningsPerShareBasic
Diluted $ 1.09us-gaap_EarningsPerShareDiluted [1] $ 1.06us-gaap_EarningsPerShareDiluted [1]
Stock Compensation Plan [Member]    
Net income per share:    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 711us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockCompensationPlanMember		 492us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockCompensationPlanMember
[1] Stock-based compensation awards for the issuance of 711 and 492 shares for the first quarters of 2015 and 2014, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive.