Short-term and Long-term Debt - Narrative (Detail)	3 Months Ended	6 Months Ended
	Jun. 27, 2020 USD ($) revision	Jun. 27, 2020 USD ($) revision	Jun. 29, 2019 USD ($)	Apr. 30, 2020 USD ($)	Dec. 28, 2019 USD ($)	Sep. 16, 2019 USD ($)
Schedule Of Debt Instruments [Line Items]
Notes payable	$ 12,100,000	$ 12,100,000			$ 202,900,000
Commercial paper outstanding					193,600,000
Other notes payable					$ 9,300,000
Proceeds from issuance of long-term debt		$ 489,900,000	$ 0
3.10% unsecured notes due 2050
Schedule Of Debt Instruments [Line Items]
Unsecured notes, interest rate	3.10%	3.10%
3.10% unsecured notes due 2050 | Unsecured Debt
Schedule Of Debt Instruments [Line Items]
Debt instrument, face amount				$ 500,000,000
Unsecured notes, interest rate				3.10%
Proceeds from issuance of long-term debt	$ 489,900,000
Payments of financing costs	4,400,000
Five-year Multi-Currency Revolving Credit Facility | Revolving Credit Facility | Line of Credit
Schedule Of Debt Instruments [Line Items]
Revolving credit facility, amount available						$ 800,000,000
Credit Facility borrowings	$ 0	$ 0
Number of allowed revisions to debt ratios | revision	2	2
Debt maturity, term		5 years
Actual debt-to-capital ratio	0.17	0.17
Actual debt-to-income ratio	0.86	0.86
Five-year Multi-Currency Revolving Credit Facility | Revolving Credit Facility | Maximum | Line of Credit
Schedule Of Debt Instruments [Line Items]
Maximum limit of required debt-to-capital ratio	0.60	0.60
Maximum limit of required debt-to-income ratio	3.50	3.50
Five-year Multi-Currency Revolving Credit Facility | Revolving Credit Facility | Maximum | Material Acquisition | Line of Credit
Schedule Of Debt Instruments [Line Items]
Maximum limit of required debt-to-capital ratio	0.65	0.65
Maximum limit of required debt-to-income ratio	4.00	4.00