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Net (Loss) Income per Share and Unaudited Pro Forma Net Income per Share - Narrative (Detail) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 02, 2020 shares | Dec. 25, 2020 shares | Dec. 27, 2019 shares | Dec. 25, 2020 | Dec. 27, 2019 shares | Mar. 27, 2020 shares | Mar. 29, 2019 shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |
Weighted average basic and diluted common shares (in shares) |  |  |  |  |  | 10,000,000 | 10,000,000
Antidilutive securities |  | 57,553,282 |  |  |  |  |
IPO |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |
Shares issued upon conversion, including shares withheld for tax withholding obligation (in shares) | 166,500,000 |  |  |  |  |  |
Common Class A |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |
Shares returned for tax payments made on behalf of holders of common stock (in shares) | 2,066,508 |  |  |  |  |  |
Weighted average basic and diluted common shares (in shares) |  |  | 10,000,000 |  | 10,000,000 |  |
Common Class A | Common Stock |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |
Priority dividend rate |  |  |  | 8.00% |  | 8.00% |
Annualized return on capital, triggering percent, remaining distributions split between Class A and Class L shareholders |  |  |  | 8.00% |  | 8.00% |
Common Class A | IPO |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |
Conversion rate | 15.822 |  |  |  |  |  |
Shares returned for tax payments made on behalf of holders of common stock (in shares) | 2,066,508 |  |  |  |  |  |
Common Class L | IPO |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |
Conversion rate | 13.010 |  |  |  |  |  |
Shares returned for tax payments made on behalf of holders of common stock (in shares) | 1,766 |  |  |  |  |  |

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