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Nature of the Business and Basis of Presentation	6 Months Ended
Nature of the Business and Basis of Presentation	Sep. 23, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of the Business and Basis of Presentation	Nature of the Business and Basis of Presentation Allegro MicroSystems, Inc., together with its consolidated subsidiaries (the “Company”), is a global leader in designing, developing and manufacturing sensing and power solutions for motion control and energy-efficient systems in automotive and industrial markets. The Company is headquartered in Manchester, New Hampshire and has a global footprint across multiple continents. The accompanying unaudited condensed consolidated financial statements have been prepared by the Company. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). The unaudited condensed consolidated financial statements include the Company’s accounts and those of its subsidiaries. All intercompany balances have been eliminated in consolidation. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended March 25, 2022 filed with the SEC on May 18, 2022, as amended by Amendment No. 1 on Form 10-K/A filed with the SEC on August 29, 2022 (as amended, the “2022 Annual Report”). In the opinion of the Company’s management, the financial information for the interim periods presented reflects all adjustments necessary for a fair statement of the Company’s financial position, results of operations and cash flows. The results reported in these unaudited condensed consolidated financial statements are not necessarily indicative of results that may be expected for the entire year. Financial Periods The Company’s second quarter three-month period is a 13-week period ending on the Friday closest to the last day in September. The Company’s second quarter of fiscal 2023 ended September 23, 2022, and the Company’s second quarter of fiscal 2022 ended September 24, 2021.