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Shareholders' Equity Net Income per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 03, 2015	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 18,947us-gaap_NetIncomeLoss	$ 23,554us-gaap_NetIncomeLoss	$ 8,481us-gaap_NetIncomeLoss	$ 16,992us-gaap_NetIncomeLoss	$ 6,425us-gaap_NetIncomeLoss	$ 20,259us-gaap_NetIncomeLoss	$ 9,926us-gaap_NetIncomeLoss	$ 23,471us-gaap_NetIncomeLoss	$ 67,974us-gaap_NetIncomeLoss	$ 60,081us-gaap_NetIncomeLoss	$ 78,094us-gaap_NetIncomeLoss
Basic weighted-average shares outstanding									53,452,000	54,866,000	55,516,000
Diluted weighted-average shares outstanding									54,193,000	55,803,000	57,076,000
Net income per share – basic									$ 1.27us-gaap_EarningsPerShareBasic	$ 1.10us-gaap_EarningsPerShareBasic	$ 1.41us-gaap_EarningsPerShareBasic
Net income per share – diluted	$ 0.35us-gaap_EarningsPerShareDiluted	$ 0.44us-gaap_EarningsPerShareDiluted	$ 0.16us-gaap_EarningsPerShareDiluted	$ 0.31us-gaap_EarningsPerShareDiluted	$ 0.12us-gaap_EarningsPerShareDiluted	$ 0.36us-gaap_EarningsPerShareDiluted	$ 0.18us-gaap_EarningsPerShareDiluted	$ 0.42us-gaap_EarningsPerShareDiluted	$ 1.25us-gaap_EarningsPerShareDiluted	$ 1.08us-gaap_EarningsPerShareDiluted	$ 1.37us-gaap_EarningsPerShareDiluted
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount									800,000	1,300,000	300,000
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Effect of dilutive securities									387,000	554,000	1,059,000
Time-based, Performance-based and Market-based Stock Awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Effect of dilutive securities									354,000	383,000	501,000