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Summary of Capped Call (Equity Options) Issued (Detail) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended					6 Months Ended		9 Months Ended
	Mar. 31, 2018	Sep. 28, 2019	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Jul. 01, 2017	Jun. 29, 2019	Jun. 30, 2018	Sep. 28, 2019	Sep. 29, 2018	Dec. 29, 2018
Option Indexed to Issuer's Equity [Line Items]
Option Indexed to Issuer's Equity, Strike Price		$ 161.52				$ 162.27			$ 161.52
Document Period End Date									Sep. 28, 2019
Long-term Debt						$ 750.0
Original Number of Options						4,600,000		3,200,000
Net Premium Paid					$ 57.3
Common Stock, Par or Stated Value Per Share				$ 100		$ 100			$ 100
Payments for Repurchase of Common Stock		$ 2.7	$ 301.8						$ 11.9	$ 514.5
Common Stock, Shares, Issued							176,902,738				176,902,738
Cash Settlement on Forward Stock Purchase Contract									$ 750.0
Minimum [Member]
Option Indexed to Issuer's Equity [Line Items]
Option Indexed to Issuer's Equity, Strike Price	$ 156.86					162.27	$ 156.65
Maximum [Member]
Option Indexed to Issuer's Equity [Line Items]
Option Indexed to Issuer's Equity, Strike Price	$ 203.92					179.53	$ 203.65
May 2017 Capped Call [Member] | Minimum [Member]
Option Indexed to Issuer's Equity [Line Items]
Option Indexed to Issuer's Equity, Strike Price									$ 161.52
May 2017 Capped Call [Member] | Maximum [Member]
Option Indexed to Issuer's Equity [Line Items]
Option Indexed to Issuer's Equity, Strike Price									$ 178.71
Capped call (equity options)
Option Indexed to Issuer's Equity [Line Items]
Common Stock Price Per Share						$ 5.43		$ 17.96

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