Net Income per Share - Computation of Net Income Per Share, Basic (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 29, 2024	Mar. 30, 2024	Jul. 01, 2023	Apr. 01, 2023	Jun. 29, 2024	Jul. 01, 2023
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net Income (Loss)	$ 52,339	$ 12,597	$ 58,035	$ (8,956)	$ 64,936	$ 49,079
Allocation of net income for basic:
Allocation of net income for basic common stock	$ 52,339		$ 58,035		$ 64,936	$ 49,079
Weighted average number of shares for basic:
Common shares, As reported - basic	11,898		12,268		11,976	12,288
Net income per share for basic:
Net income per common share - basic	$ 4.4		$ 4.73		$ 5.42	$ 3.99
Common Class A
Allocation of net income for basic:
Allocation of net income for basic common stock	$ 43,116		$ 48,130		$ 53,575	$ 40,722
Weighted average number of shares for basic:
Common shares, As reported - basic	9,801		10,174		9,881	10,196
Net income per share for basic:
Net income per common share - basic	$ 4.4		$ 4.73		$ 5.42	$ 3.99
Common Class B
Allocation of net income for basic:
Allocation of net income for basic common stock	$ 9,097		$ 9,783		$ 11,213	$ 8,259
Weighted average number of shares for basic:
Common shares, As reported - basic	2,068		2,068		2,068	2,068
Net income per share for basic:
Net income per common share - basic	$ 4.4		$ 4.73		$ 5.42	$ 3.99
Unvested participating shares
Allocation of net income for basic:
Allocation of net income for basic unvested participating shares	$ 126		$ 122		$ 148	$ 98
Weighted average number of shares for basic:
Common shares, As reported - basic	29		26		27	24