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Financial Instruments - Narrative (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017	Sep. 29, 2018	Dec. 30, 2017
Equity Forwards
Investment Holdings [Line Items]
Equity forwards in place of common stock associated with its deferred compensation plans (in shares)			95,300
Treasury locks
Investment Holdings [Line Items]
Treasury locks outstanding			$ 0	$ 300,000,000
Treasury locks settled	$ 300,000,000	$ 250,000,000
Gain on the settlement of the treasury lock	$ 13,300,000	$ 14,900,000
Fair Value Hedging
Investment Holdings [Line Items]
Notional amount of interest rate swaps outstanding and designated as fair value hedges			$ 100,000,000	$ 100,000,000

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- Definition

Nominal or face amount used to calculate payments on the derivative asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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-Section 50
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