Debt (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended	1 Months Ended	3 Months Ended			12 Months Ended
	Mar. 30, 2013	Dec. 29, 2012	May 31, 2009 Call option and warrant item	Mar. 30, 2013 Call option and warrant	Mar. 30, 2013 Warrant	Mar. 30, 2013 4.50% convertible senior notes due 2013	Dec. 29, 2012 4.50% convertible senior notes due 2013
Debt
Principal amount of convertible notes outstanding						$ 215
Stock Price (in dollars per share)						$ 29.81
Amount if converted value in excess of face amount						273
Amount in shares if converted value is in excess of face amount						9.2
Potential incremental net share settlement in excess of the face amount of the notes that could be issued upon conversion of convertible notes, after giving effect to the exercise of the call options and warrants						7.7
Number of net shares issued upon settlement of outstanding warrants during the period						3.8
Number of counterparties			2
Right to acquire shares from counterparties related to amendment of call option and warrant transaction		16.4
Initial conversion price per share							$ 13.125
Exercise price of common share (in dollars per share)							$ 15.75
Period for computing VWAP of common stock to determine settlement values				45 days	45 days
Number of warrants exercised and settled (in shares)					8.0
VWAP (in dollars per share)	$ 29.90
Amount of reduction in treasury stock	$ 92
Number of warrants outstanding (in shares)					8.4