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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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