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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | Common Stock Common Class A | Common Stock Common Class B | Additional Paid-in Capital | Accumulated Other Comprehensive Loss | Retained Earnings | Retained Earnings Cumulative Effect, Period of Adoption, Adjustment
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 28, 2019 | $ 735,636 |  | $ 94 | $ 27 | $ 571,784 | $ (1,669) | $ 165,400 |
Balance (in shares) at Dec. 28, 2019 |  |  | 9,371,000 | 2,673,000 |  |  |  |
Net income | 18,234 |  |  |  |  |  | 18,234 |
Stock options exercised and restricted shares activities | 1,858 |  |  |  | 1,858 |  |  |
Stock options exercised and restricted shares activities (in shares) |  |  | 38,000 |  |  |  |  |
Stock-based compensation expense | 2,566 |  |  |  | 2,566 |  |  |
Conversion from Class B to Class A |  |  | $ 2 | $ (2) |  |  |  |
Conversion from Class B to Class A (in shares) |  |  | 150,000 | (150,000) |  |  |  |
Foreign currency translation adjustment | (58) |  |  |  |  | (58) |  |
Balance at Mar. 28, 2020 | 758,236 |  | $ 96 | $ 25 | 576,208 | (1,727) | 183,634 |
Balance (in shares) at Mar. 28, 2020 |  |  | 9,559,000 | 2,523,000 |  |  |  |
Balance at Dec. 26, 2020 | 956,967 | $ (54) | $ 100 | $ 22 | 599,737 | (252) | 357,360 | $ (54)
Balance (in shares) at Dec. 26, 2020 |  |  | 10,005,000 | 2,178,000 |  |  |  |
Net income | 65,565 |  |  |  |  |  | 65,565 |
Stock options exercised and restricted shares activities | $ 1,269 |  | $ 1 |  | 1,268 |  |  |
Stock options exercised and restricted shares activities (in shares) | 31,020 |  | 48,000 |  |  |  |  |
Stock-based compensation expense | $ 4,957 |  |  |  | 4,957 |  |  |
Accounting Standards Update [Extensible List] |  | ASU 2019-12 |  |  |  |  |  | ASU 2019-12
Foreign currency translation adjustment | 20 |  |  |  |  | 20 |  |
Balance at Mar. 27, 2021 | $ 1,028,724 |  | $ 101 | $ 22 | $ 605,962 | $ (232) | $ 422,871 |
Balance (in shares) at Mar. 27, 2021 |  |  | 10,053,000 | 2,178,000 |  |  |  |

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