Capital Transactions - Additional Information (Detail) - USD ($) $ in Thousands		6 Months Ended
	Apr. 30, 2008	Jun. 30, 2019	Jul. 01, 2018
Capital Transactions [Line Items]
Share based compensation		$ 2,045	$ 1,728
Long-Term Performance Equity Plan [Member]
Capital Transactions [Line Items]
Award settled in cash or shares, average closing prices of shares during trading days of performance period		20 days
Long-Term Performance Equity Plan [Member] | Selling, Delivery and Administrative Expenses [Member]
Capital Transactions [Line Items]
Share based compensation		$ 6,700	$ 1,000
Class B Common Stock [Member]
Capital Transactions [Line Items]
Term of performance unit award agreement	10 years
Performance unit award agreement expiration period	2018