Net Income per Share - Computation of Earnings Per Share, Basic (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net Income	$ 14,553	$ 191,960	$ 110,041
Allocation of net income for basic:
Allocation of net income for basic common stock	$ 14,553	$ 191,960	$ 110,041
Weighted average number of shares for basic:
Weighted-average number of common shares - basic	12,280	12,204	11,886
Net income per share for basic:
Net income per common share - basic	$ 1.19	$ 15.73	$ 9.26
Common Class A
Allocation of net income for basic:
Allocation of net income for basic common stock	$ 11,995	$ 153,106	$ 82,474
Weighted average number of shares for basic:
Weighted-average number of common shares - basic	10,121	9,734	8,908
Net income per share for basic:
Net income per common share - basic	$ 1.19	$ 15.73	$ 9.26
Common Class B
Allocation of net income for basic:
Allocation of net income for basic common stock	$ 2,506	$ 37,690	$ 26,600
Weighted average number of shares for basic:
Weighted-average number of common shares - basic	2,115	2,396	2,873
Net income per share for basic:
Net income per common share - basic	$ 1.19	$ 15.73	$ 9.26
Unvested participating shares
Allocation of net income for basic:
Allocation of net income for basic unvested participating shares	$ 52	$ 1,164	$ 967
Weighted average number of shares for basic:
Weighted-average number of common shares - basic	44	74	105