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Cover Page
 12 Months Ended
Mar. 28, 2020
shares
Document Information [Line Items]  
Document Type 20-F
Amendment Flag false
Document Period End Date Mar. 28, 2020
Document Fiscal Year Focus 2020
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 --03-28
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
Class A Common Stock [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 10,252,911
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