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Pre-Production Costs Related to Long-Term Supply Agreements - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 26, 2015	Sep. 27, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Capitalized pre-production E&D costs	$ 115.9	$ 143.0
Capitalized pre-production tooling costs related to customer-owned tools	74.8	118.2
Cash collected related to E&D and tooling costs	$ 155.6	$ 247.2

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- Definition

Amount of recoverable preproduction engineering and design costs related to long term supply agreements capitalized during the reporting period.

+ References

No definition available.

+ Details

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X

- Definition

Amount of recoverable preproduction tooling costs related to long term supply agreements capitalized during the reporting period.

+ References

No definition available.

+ Details

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X

- Definition

Cash recoveries of preproduction engineering, design and tooling costs incurred on behalf of a customer.

+ References

No definition available.

+ Details

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Namespace Prefix:	lea_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- References

No definition available.

+ Details

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