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Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2021
Equity [Abstract] |
Summary of Changes in Accumulated Other Comprehensive Income (Loss) | For further discussion of Sonic’s accumulated other comprehensive income (loss), see Note 13, “Accumulated Other Comprehensive Income (Loss),” to the consolidated financial statements in Sonic’s Annual Report on Form 10-K for the year ended December 31, 2020. For further discussion of Sonic’s defined benefit pension plan, see Note 10, “Employee Benefit Plans,” to the consolidated financial statements in Sonic’s Annual Report on Form 10-K for the year ended December 31, 2020.

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