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Comprehensive Income (Loss) and Equity - Narrative (Details) $ / shares in Units, ¥ in Millions	3 Months Ended					9 Months Ended		117 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2020 CNY (¥)	Oct. 03, 2020 USD ($)	Apr. 04, 2020 $ / shares	Sep. 28, 2019 USD ($) $ / shares	Oct. 03, 2020 USD ($) $ / shares	Sep. 28, 2019 USD ($) $ / shares	Oct. 03, 2020 USD ($) $ / shares	Jul. 04, 2020	Apr. 02, 2011 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign currency translation adjustments related to intercompany transactions (gains) losses			$ (500,000)		$ 300,000	$ 500,000	$ 200,000
Aggregate purchases authorized under common stock share repurchase program										$ 6,100,000,000
Aggregate Repurchases					$ 75,900,000	$ 70,000,000.0	$ 355,400,000	$ 4,700,000,000
Average price (in dollars per share) | $ / shares					$ 123.06	$ 109.22	$ 136.48	$ 90.07
Cash dividends declared per share | $ / shares				$ 0.77	$ 0.75	$ 0.77	$ 2.25
Shanghai Lear STEC Automotive Parts Co., Ltd
Accumulated Other Comprehensive Income (Loss) [Line Items]
Ownership percentage by noncontrolling owners									45.00%
Forecast
Accumulated Other Comprehensive Income (Loss) [Line Items]
Percentage of undistributed retained earnings to be paid at closing	50.00%	50.00%
Forecast | Shanghai Lear STEC Automotive Parts Co., Ltd
Accumulated Other Comprehensive Income (Loss) [Line Items]
Payments for repurchase of redeemable noncontrolling interest	$ 92,200,000	¥ 626.0
Forecast | Shanghai Lear STEC Automotive Parts Co., Ltd | Retained Earnings
Accumulated Other Comprehensive Income (Loss) [Line Items]
Payments for repurchase of redeemable noncontrolling interest	$ 25,800,000	¥ 175.5

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