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Changes in Shareholder's Equity - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2007	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012
Shareholders Equity [Line Items]
Repurchase of outstanding common stock, authorized amount	$ 300
Convertible senior subordinated notes maturity year		2017		2017
Convertible senior subordinated notes interest rate		3.875%		3.875%
Average market price of common stock		$ 61.32		$ 61.32
Shares issuable upon exercise of warrants included in diluted shares		0.4		0.3
Number of shares under warrants exercised				7.8
Strike price of the warrants				$ 74.65
Weighted average antidilutive which were not included in the calculation of earnings per share		7.9	8.8	7.9	9.0

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Exercise price of the warrants.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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Price of a single share of a number of saleable stocks of a company.

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