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Shareholders' Equity (Share Repurchases) (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	12 Months Ended
	Dec. 28, 2016	Dec. 30, 2015	Dec. 31, 2014
Equity, Class of Treasury Stock [Line Items]
Common stock shares repurchased during the period (shares)	4.6	8.5	5.3
Common stock shares repurchased during the period (value in US$)	$ 51,771	$ 92,676	$ 35,990
Share Repurchase Program 2016 [Member]
Equity, Class of Treasury Stock [Line Items]
Share repurchase, authorized amount (dollars)	100,000
Remaining shares to be repurchased (value in US$)	79,200
Share Repurchase Program 2015 [Member]
Equity, Class of Treasury Stock [Line Items]
Share repurchase, authorized amount (dollars)	$ 100,000
Share Repurchase Program 2013 [Member]
Equity, Class of Treasury Stock [Line Items]
Number of shares approved under stock repurchase program (shares)	10.0
November 2015 Accelerated Share Repurchase [Member]
Equity, Class of Treasury Stock [Line Items]
Share repurchase, authorized amount (dollars)		$ 50,000
Common stock shares repurchased during the period (shares)	1.5	3.5
Volume-weighted average price	$ 9.90
Common stock shares repurchased during the period (value in US$)	$ 13,100	$ 36,900
Remaining shares to be repurchased (value in US$)		$ 13,100
November 2016 Accelerated Share Repurchase [Member]
Equity, Class of Treasury Stock [Line Items]
Share repurchase, authorized amount (dollars)	$ 25,000
Common stock shares repurchased during the period (shares)	1.5
Common stock shares repurchased during the period (value in US$)	$ 18,100
Remaining shares to be repurchased (value in US$)	$ 6,900

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Amount of stock repurchase plan authorized.

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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