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Comprehensive Income and Equity - Additional Information (Detail) (USD $) | 3 Months Ended | 51 Months Ended |
--- | --- | --- | ---
Mar. 28, 2015 | Mar. 29, 2014 | Mar. 28, 2015 | Feb. 28, 2015
Equity [Abstract] |  |  |  |
Defined benefits plans, pretax reclassification adjustments for accumulated gains (losses) | $ (1,500,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax |  |  |
Derivative instruments and hedging activities, pretax reclassification adjustments for accumulated gains (losses) | (4,700,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax | 1,000,000 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax |  |
Foreign currency translation adjustments related to intercompany transactions, long-term gain (loss) | (13,400,000)us-gaap_AdjustmentForLongTermIntercompanyTransactionsGrossOfTax | 500,000 us-gaap_AdjustmentForLongTermIntercompanyTransactionsGrossOfTax |  |
Increase in existing common stock share repurchase program |  |  |  | 661,000,000 lea_StockRepurchaseProgramAdditionalAuthorizedAmount
Aggregate purchases authorized under common stock share repurchase program | 2,900,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |  | 2,900,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 | 1,000,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1
Payments for repurchases of outstanding common stock | 112,400,000 us-gaap_PaymentsForRepurchaseOfCommonStock | 0 us-gaap_PaymentsForRepurchaseOfCommonStock | 2,000,000,000 us-gaap_PaymentsForRepurchaseOfCommonStock |
Common stock repurchased | 1,030,261 us-gaap_TreasuryStockSharesAcquired |  |  |
Common stock repurchased, average price per share (in dollars per share) | $ 109.09 us-gaap_TreasuryStockAcquiredAverageCostPerShare |  | $ 63.49 us-gaap_TreasuryStockAcquiredAverageCostPerShare |
Common stock, share repurchase program, remaining authorized amount | 887,600,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  | 887,600,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |
Cash dividends declared per share (in dollars per share) | $ 0.25 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.2 us-gaap_CommonStockDividendsPerShareDeclared |  |
Dividends declared | 20,300,000 us-gaap_DividendsCommonStockCash | 17,200,000 us-gaap_DividendsCommonStockCash |  |
Dividends paid | $ 22,000,000 us-gaap_PaymentsOfDividendsCommonStock | $ 17,500,000 us-gaap_PaymentsOfDividendsCommonStock |  |

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- Definition Current period adjustment resulting from gains and losses on intercompany foreign currency transactions that are of a long-term-investment nature, that is, settlement is not planned or anticipated in the foreseeable future. Resulting from the entities to the transaction being consolidated, combined, or accounted for by the equity method in the reporting entity's financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32157-110900 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 35 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6939497&loc=d3e30304-110892 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900 + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e689-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph c -URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41638-113959 + Details
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- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e689-108580 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 + Details
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