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Net Income per Share - Computation of Earnings Per Share, Basic (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 27, 2021 | Mar. 28, 2020
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Net income |  | $ 65,565 | $ 18,234
Allocation of net income for basic: |  |  |
Allocation of net income for basic common stock |  | $ 65,565 | $ 18,234
Weighted average number of shares for basic: |  |  |
Weighted-average number of common shares — basic |  | 12,271 | 12,157
Net income per share for basic: |  |  |
Net income per common share - basic |  | $ 5.34 | $ 1.50
Common Class A |  |  |
Allocation of net income for basic: |  |  |
Allocation of net income for basic common stock |  | $ 53,628 | $ 14,136
Weighted average number of shares for basic: |  |  |
Weighted-average number of common shares — basic |  | 10,037 | 9,425
Net income per share for basic: |  |  |
Net income per common share - basic |  | $ 5.34 | $ 1.50
Common Class B |  |  |
Allocation of net income for basic: |  |  |
Allocation of net income for basic common stock |  | $ 11,638 | $ 3,967
Weighted average number of shares for basic: |  |  |
Weighted-average number of common shares — basic | [1] | 2,178 | 2,645
Net income per share for basic: |  |  |
Net income per common share - basic |  | $ 5.34 | $ 1.50
Unvested participating shares |  |  |
Allocation of net income for basic: |  |  |
Allocation of net income for basic unvested participating shares |  | $ 299 | $ 131
Weighted average number of shares for basic: |  |  |
Weighted-average number of common shares — basic |  | 56 | 87
[1] | Change in Class B Common Stock resulted from the conversion of 215,000 shares to Class A Common Stock on May 6, 2020 and 130,000 shares to Class A Common Stock on November 3, 2020 with the ending number of shares reflecting the weighted average for the period.

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