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Other (Income) Expense, Net - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jul. 02, 2016	Jul. 02, 2016	Jun. 27, 2015
Debt Instrument [Line Items]
Net foreign currency transaction gains (losses)	$ (2.2)	$ (1.8)	$ (14.3)
Gain (loss) on extinguishment of debt			$ (14.3)
Beijing BAI Lear Automotive Systems Co., Ltd.
Debt Instrument [Line Items]
Gain on consolidation of affiliate	$ 30.3	$ 30.3

X

- Definition

In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)(2)
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 20
-Section 50
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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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