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Document and Entity Information
 12 Months Ended
Mar. 29, 2014
Document Information [Line Items]  
Document Type 20-F
Amendment Flag false
Document Period End Date Mar. 29, 2014
Document Fiscal Year Focus 2014
Document Fiscal Period Focus FY
Trading Symbol BGI
Entity Registrant Name BIRKS GROUP INC.
Entity Central Index Key 0001179821
Current Fiscal Year End Date --03-29
Entity Well-known Seasoned Issuer No
Entity Current Reporting Status Yes
Entity Filer Category Non-accelerated Filer
Class A Common Stock [Member]
  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 10,131,539
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