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Net Income per Share - Computation of Net Income Per Share, Basic (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 27, 2025
Jun. 28, 2025
Mar. 29, 2025
Sep. 28, 2024
Jun. 29, 2024
Mar. 30, 2024
Sep. 27, 2025
Sep. 28, 2024
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                
Net Income (Loss) $ 46,155 $ 60,433 $ 24,412 $ 33,514 $ 52,339 $ 12,597 $ 131,000 $ 98,450
Allocation of net income for basic:                
Allocation of net income for basic common stock $ 46,155     $ 33,514     $ 131,000 $ 98,450
Weighted average number of shares for basic:                
Weighted-average number of common shares - basic 10,855     11,682     11,073 11,878
Net income per share for basic:                
Net income per common share - basic $ 4.25     $ 2.87     $ 11.83 $ 8.29
Common Class A                
Allocation of net income for basic:                
Allocation of net income for basic common stock $ 37,231     $ 27,500     $ 106,174 $ 81,082
Weighted average number of shares for basic:                
Weighted-average number of common shares - basic 8,756     9,586     8,974 9,783
Net income per share for basic:                
Net income per common share - basic $ 4.25     $ 2.87     $ 11.83 $ 8.29
Common Class B                
Allocation of net income for basic:                
Allocation of net income for basic common stock $ 8,793     $ 5,933     $ 24,467 $ 17,140
Weighted average number of shares for basic:                
Weighted-average number of common shares - basic 2,068     2,068     2,068 2,068
Net income per share for basic:                
Net income per common share - basic $ 4.25     $ 2.87     $ 11.83 $ 8.29
Unvested participating shares                
Allocation of net income for basic:                
Allocation of net income for basic unvested participating shares $ 131     $ 81     $ 359 $ 228
Weighted average number of shares for basic:                
Weighted-average number of common shares - basic 31     28     31 27