Net Income per Share - Computation of Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Earnings to Common Shareholders, As reported - basic	$ 76,250	$ 67,263	$ 14,553
Common shares, As reported - basic	12,243,000	12,317,000	12,280,000
EPS, As reported - basic	$ 6.23	$ 5.46	$ 1.19
Add: effect of dilutive potential common shares Share-based awards	40,000	56,000	138,000
Common Shares, Net effect of unvested participating shares			62
Earnings to Common Shareholders, Net effect of unvested participating shares	$ 0	$ 1	$ 52
Earnings to Common Shareholders, Net income per common share - diluted	$ 76,096	$ 67,106	$ 14,553
Common Shares, Net income per common share - diluted	12,258,000	12,345,000	12,436,000
EPS, Net income per common share — diluted	$ 6.21	$ 5.44	$ 1.17
Common Class A
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Earnings to Common Shareholders, As reported - basic	$ 63,216	$ 55,812	$ 11,995
Common shares, As reported - basic	10,150,000	10,221,000	10,121,000
EPS, As reported - basic	$ 6.23	$ 5.46	$ 1.19
Common Class B
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Earnings to Common Shareholders, As reported - basic	$ 12,880	$ 11,293	$ 2,506
Common shares, As reported - basic	2,068,000	2,068,000	2,115,000
EPS, As reported - basic	$ 6.23	$ 5.46	$ 1.19
Earnings to Common Shareholders, Class B Common Stock	$ 12,880	$ 11,293	$ 2,506
Class B Common Stock	2,068,000	2,068,000	2,115,000