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Cover Page
 12 Months Ended
Mar. 26, 2022
shares
Document Information [Line Items]  
Document Type 20-F
Amendment Flag false
Document Period End Date Mar. 26, 2022
Document Fiscal Year Focus 2022
Document Fiscal Period Focus FY
Document Annual Report true
Document Transition Report false
Document Shell Company Report false
Trading Symbol BGI
Entity Registrant Name BIRKS GROUP INC.
Entity Central Index Key 0001179821
Current Fiscal Year End Date --03-26
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Filer Category Non-accelerated Filer
Entity Shell Company false
Entity Emerging Growth Company false
Entity Interactive Data Current Yes
Title of 12(b) Security Class A Voting Shares
Security Exchange Name NYSE
Entity Address, Country CA
ICFR Auditor Attestation Flag false
Entity File Number 001-32635
Entity Incorporation, State or Country Code Z4
Entity Address, Address Line One 2020 Robert-Bourassa Blvd.
Entity Address, City or Town Montreal Québec
Entity Address, Postal Zip Code H3A 2A5
Document Registration Statement false
Document Accounting Standard U.S. GAAP
Auditor Name KPMG LLP
Auditor Firm ID 85
Auditor Location Montreal, QC, Canada
Business Contact [Member]  
Document Information [Line Items]  
Entity Address, Country CA
Entity Address, Address Line One 2020 Robert-Bourassa Blvd.
Entity Address, Address Line Two Suite 200
Entity Address, City or Town Montreal Québec
Entity Address, Postal Zip Code H3A 2A5
City Area Code 514
Local Phone Number 397-2592
Contact Personnel Name Katia Fontana
Contact Personnel Fax Number 514-397-2537
Class A Common Stock [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 10,795,443
Class B Common Stock [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 7,717,970
Series A Preferred Stock [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 0