Deferred Compensation Plans - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 28, 2018	Sep. 29, 2017	Sep. 28, 2018	Sep. 29, 2017	Dec. 29, 2017
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Trading securities	$ 63,270,000		$ 63,270,000		$ 53,350,000
Deferred compensation plan vested amounts due	65,036,000		65,036,000		$ 59,050,000
Change in market value of trust assets	$ 1,840,000	$ 1,699,000	$ 2,577,000	$ 4,617,000
Maximum
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Percentage of compensation deferred			100.00%