Short-term and Long-term Debt - Short-term and Long-term Debt (Schedule of Debt Additional Information) (Detail)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 30, 2017
4.25% unsecured notes due 2018
Schedule Of Debt Instruments [Line Items]
Unsecured notes, interest rate		4.25%
Unsecured notes, maturity year		2018
6.70% unsecured notes due 2019
Schedule Of Debt Instruments [Line Items]
Unsecured notes, interest rate		6.70%
Unsecured notes, maturity year	2019	2019
6.125% unsecured notes due 2021
Schedule Of Debt Instruments [Line Items]
Unsecured notes, interest rate	6.125%	6.125%
Unsecured notes, maturity year	2021	2021
3.25% unsecured notes due 2027
Schedule Of Debt Instruments [Line Items]
Unsecured notes, interest rate	3.25%	3.25%
Unsecured notes, maturity year	2027	2027
4.10% unsecured notes due 2048
Schedule Of Debt Instruments [Line Items]
Unsecured notes, interest rate	4.10%
Unsecured notes, maturity year	2048