Capital Transactions - Summary of the Awards Each Year (Detail) - Class B Common Stock [Member] - shares	12 Months Ended
	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Schedule Of Capitalization Equity [Line Items]
Date of approval for award	Mar. 05, 2019	Mar. 06, 2018	Mar. 07, 2017
Fiscal year of service covered by award	2018	2017	2016
Shares settled in cash	15,476	16,504	18,980
Increase in Class B Common Stock shares outstanding	19,224	20,296	21,020
Total Class B Common Stock awarded	34,700	36,800	40,000