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Comprehensive Income and Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 9 Months Ended | 33 Months Ended | 3 Months Ended | 1 Months Ended
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Apr. 25, 2013 | Jan. 31, 2013 | Sep. 28, 2013 Director | Jun. 29, 2013 | Sep. 29, 2012 | Sep. 28, 2013 Director | Sep. 29, 2012 | Sep. 28, 2013 Director | Jun. 29, 2013 Additional Paid-in Capital | Jan. 31, 2013 Additional Authorization | Feb. 28, 2013 2013 Share Repurchase Program | Apr. 30, 2013 Two-Year Stock Repurchase Program
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Share Repurchase Program, description |  | Common Stock Share Repurchase Program - In January 2013, the Company's Board of Directors authorized an increase of $800 million to the Company's existing common stock share repurchase program, which permits the discretionary repurchase of the Company's common stock, to provide for aggregate repurchases of $1.5 billion and extended the term of the program to January 10, 2016. |  |  |  |  |  |  |  |  |  |
Common stock, aggregate authorized repurchase amount |  | $ 1,500 |  |  |  |  |  |  |  | $ 800 | $ 600 | $ 750
Number of directors |  |  | 3 |  |  | 3 |  | 3 |  |  |  |
Accelerated stock repurchase agreement amount | 800 |  |  |  |  |  |  |  |  |  |  |
Amount paid in accelerated stock repurchase agreement |  |  |  | 800 |  |  |  |  |  |  |  |
Common stock, repurchased |  |  |  | 11,862,836 |  | 15,533,758 | 4,200,151 |  |  |  |  |
Percentage of treasury stock repurchased |  |  |  | 80.00% |  |  |  |  | 20.00% |  |  |
Value of common stock repurchased, per share |  |  |  | $ 53.95 |  |  |  |  |  |  |  |
Value of common stock repurchased |  |  |  |  | 50.1 | 1,000.1 | 172.6 | 1,500.0 | 160.0 |  |  |
Common stock, share repurchase program amount |  |  |  |  |  | 750 |  |  |  |  |  |
Common stock, at an average purchase price excluding commission |  |  |  |  |  | $ 54.08 | $ 41.10 |  |  |  |  |
Repurchase of common stock |  |  |  |  |  | 1,000.1 | 172.6 |  |  |  |  |
Cash dividends declared per share |  |  |  |  |  | $ 0.17 | $ 0.14 |  |  |  |  |
Dividends declared to Lear Corporation stockholders |  |  | 14.2 |  | 13.9 | 44.8 | 42.3 |  |  |  |  |
Dividends paid to Lear Corporation stockholders |  |  |  |  |  | $ 44.8 | $ 40.9 |  |  |  |  |

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- Definition The price paid per share to immediately purchase the targeted number of shares on the date of executing the accelerated share repurchase agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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