Net Income per Share - Computation of Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Earnings to Common Shareholders, As reported - basic	$ 14,553	$ 191,960	$ 110,041
Common shares, As reported - basic	12,280	12,204	11,886
EPS, As reported - basic	$ 1.19	$ 15.73	$ 9.26
Add: effect of dilutive potential common shares Share-based awards	138	153	127
Earnings to Common Shareholders, Net effect of unvested participating shares	$ 52	$ 14	$ 10
Earnings to Common Shareholders, Net income per common share - diluted	$ 14,553	$ 190,810	$ 109,084
Common Shares, Net income per common share - diluted	12,436	12,283	11,908
EPS, Net income per common share — diluted	$ 1.17	$ 15.53	$ 9.16
Common Class A
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Earnings to Common Shareholders, As reported - basic	$ 11,995	$ 153,106	$ 82,474
Common shares, As reported - basic	10,121	9,734	8,908
EPS, As reported - basic	$ 1.19	$ 15.73	$ 9.26
Common Class B
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Earnings to Common Shareholders, As reported - basic	$ 2,506	$ 37,690	$ 26,600
Common shares, As reported - basic	2,115	2,396	2,873
EPS, As reported - basic	$ 1.19	$ 15.73	$ 9.26
Earnings to Common Shareholders, Class B Common Stock	$ 2,506	$ 37,690	$ 26,600
Common Shares, Net effect of unvested participating shares	62
Class B Common Stock	2,115	2,396	2,873