Net Income per Share - Computation of Earnings Per Share, Basic (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net Income	$ 76,250	$ 67,263	$ 14,553
Allocation of net income for basic:
Allocation of net income for basic common stock	$ 76,250	$ 67,263	$ 14,553
Weighted average number of shares for basic:
Weighted-average number of common shares - basic	12,243	12,317	12,280
Net income per share for basic:
Net income per common share - basic	$ 6.23	$ 5.46	$ 1.19
Common Class A
Allocation of net income for basic:
Allocation of net income for basic common stock	$ 63,216	$ 55,812	$ 11,995
Weighted average number of shares for basic:
Weighted-average number of common shares - basic	10,150	10,221	10,121
Net income per share for basic:
Net income per common share - basic	$ 6.23	$ 5.46	$ 1.19
Common Class B
Allocation of net income for basic:
Allocation of net income for basic common stock	$ 12,880	$ 11,293	$ 2,506
Weighted average number of shares for basic:
Weighted-average number of common shares - basic	2,068	2,068	2,115
Net income per share for basic:
Net income per common share - basic	$ 6.23	$ 5.46	$ 1.19
Unvested participating shares
Allocation of net income for basic:
Allocation of net income for basic unvested participating shares	$ 154	$ 158	$ 52
Weighted average number of shares for basic:
Weighted-average number of common shares - basic	25	28	44