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Net (Loss) Income per Share - Computation of (Loss) Earnings Per Share, Basic (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 25, 2021 | Jun. 26, 2021 | Mar. 27, 2021 | Sep. 26, 2020 | Jun. 27, 2020 | Mar. 28, 2020 | Sep. 25, 2021 | Sep. 26, 2020
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |
Net (loss) income |  | $ (58,421) | $ 59,195 | $ 65,565 | $ 80,768 | $ 60,141 | $ 18,234 | $ 66,338 | $ 159,143
Allocation of net (loss) income for basic: |  |  |  |  |  |  |  |  |
Allocation of net (loss) income for basic common stock |  | $ (58,421) |  |  | $ 80,768 |  |  | $ 66,338 | $ 159,143
Weighted average number of shares for basic: |  |  |  |  |  |  |  |  |
Weighted-average number of common shares — basic |  | 12,282 |  |  | 12,221 |  |  | 12,279 | 12,191
Net (loss) income per share for basic: |  |  |  |  |  |  |  |  |
Net (loss) income per common share - basic |  | $ (4.76) |  |  | $ 6.61 |  |  | $ 5.40 | $ 13.05
Common Class A |  |  |  |  |  |  |  |  |
Allocation of net (loss) income for basic: |  |  |  |  |  |  |  |  |
Allocation of net (loss) income for basic common stock |  | $ (48,356) |  |  | $ 65,074 |  |  | $ 54,586 | $ 126,146
Weighted average number of shares for basic: |  |  |  |  |  |  |  |  |
Weighted-average number of common shares — basic |  | 10,166 |  |  | 9,846 |  |  | 10,103 | 9,663
Net (loss) income per share for basic: |  |  |  |  |  |  |  |  |
Net (loss) income per common share - basic |  | $ (4.76) |  |  | $ 6.61 |  |  | $ 5.40 | $ 13.05
Common Class B |  |  |  |  |  |  |  |  |
Allocation of net (loss) income for basic: |  |  |  |  |  |  |  |  |
Allocation of net (loss) income for basic common stock |  | $ (9,885) |  |  | $ 15,254 |  |  | $ 11,502 | $ 31,996
Weighted average number of shares for basic: |  |  |  |  |  |  |  |  |
Weighted-average number of common shares — basic | [1] | 2,078 |  |  | 2,308 |  |  | 2,129 | 2,451
Net (loss) income per share for basic: |  |  |  |  |  |  |  |  |
Net (loss) income per common share - basic |  | $ (4.76) |  |  | $ 6.61 |  |  | $ 5.40 | $ 13.05
Unvested participating shares |  |  |  |  |  |  |  |  |
Allocation of net (loss) income for basic: |  |  |  |  |  |  |  |  |
Allocation of net (loss) income for basic unvested participating shares |  | $ (180) |  |  | $ 440 |  |  | $ 250 | $ 1,001
Weighted average number of shares for basic: |  |  |  |  |  |  |  |  |
Weighted-average number of common shares — basic |  | 38 |  |  | 67 |  |  | 47 | 77
[1] | Change in Class B Common Stock resulted from the conversion of 130,000 shares to Class A Common Stock on November 3, 2020 and 99,983 shares to Class A Common Stock on May 14, 2021 with the ending number of shares reflecting the weighted average for the period.

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