Share Components of Outstanding Common Stock (Detail) - shares	Dec. 29, 2019	Dec. 30, 2018
Components Of Common Stock [Line Items]
Total Common Stock	38,934,009	40,977,561
Voting [Member]
Components Of Common Stock [Line Items]
Total Common Stock	38,930,646	40,974,200
Non-Voting [Member]
Components Of Common Stock [Line Items]
Total Common Stock	3,363	3,361