Capital Transactions - Summary of the Awards Each Year (Detail) - Class B Common Stock [Member] - shares	12 Months Ended
	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017
Schedule of Capitalization, Equity [Line Items]
Date of approval for award	Mar. 06, 2018	Mar. 07, 2017	Mar. 08, 2016
Fiscal year of service covered by award	2017	2016	2015
Shares settled in cash	16,504	18,980	19,080
Increase in Class B Common Stock shares outstanding	20,296	21,020	20,920
Total Class B Common Stock awarded	36,800	40,000	40,000