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Cover Page - USD ($)
 12 Months Ended
Mar. 28, 2025
May 19, 2025
Sep. 27, 2024
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Mar. 28, 2025    
Current Fiscal Year End Date --03-28    
Document Transition Report false    
Entity File Number 001-39675    
Entity Registrant Name ALLEGRO MICROSYSTEMS, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 46-2405937    
Entity Address, Address Line One 955 Perimeter Road    
Entity Address, City or Town Manchester    
Entity Address, State or Province NH    
Entity Address, Postal Zip Code 03103    
City Area Code 603    
Local Phone Number 626-2300    
Title of 12(b) Security Common Stock, par value $0.01 per share    
Trading Symbol ALGM    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 2,996,240,853
Entity Common Stock, Shares Outstanding (in shares)   184,901,228  
Documents Incorporated by Reference

Portions of the registrant’s proxy statement for its 2025 Annual Meeting of Stockholders to be filed pursuant to Regulation 14A within 120 days of the end of the registrant’s fiscal year ended March 28, 2025 are incorporated by reference into Part III of this Annual Report on Form 10-K to the extent stated herein.

    
Entity Central Index Key 0000866291    
Amendment Flag false    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Document Financial Statement Error Correction [Flag] false    
Auditor Name PricewaterhouseCoopers LLP    
Auditor Firm ID 238    
Auditor Location Boston, Massachusetts    
Auditor Opinion

Opinions on the Financial Statements and Internal Control over Financial Reporting

We have audited the accompanying consolidated balance sheets of Allegro MicroSystems, Inc. and its subsidiaries (the “Company”) as of March 28, 2025 and March 29, 2024, and the related consolidated statements of operations, of comprehensive (loss) income, of changes in stockholders’ equity and of cash flows for each of the three years in the period ended March 28, 2025, including the related notes (collectively referred to as the “consolidated financial statements”). We also have audited the Company’s internal control over financial reporting as of March 28, 2025, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of March 28, 2025 and March 29, 2024, and the results of its operations and its cash flows for each of the three years in the period ended March 28, 2025 in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of March 28, 2025, based on criteria established in Internal Control - Integrated Framework (2013) issued by the COSO.