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Document and Entity Information
Apr. 09, 2021
Cover [Abstract]  
Amendment Flag false
Entity Central Index Key 0000866291
Document Type 8-K
Document Period End Date Apr. 09, 2021
Entity Registrant Name ALLEGRO MICROSYSTEMS, INC.
Entity Incorporation State Country Code DE
Entity File Number 001-39675
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
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, par value $0.01 per share
Trading Symbol ALGM
Security Exchange Name NASDAQ
Entity Emerging Growth Company true
Entity Ex Transition Period false