XML 87 R74.htm IDEA: XBRL DOCUMENT
v3.19.2

Segmented Information - Additional Information (Detail) | 12 Months Ended
--- | ---
Mar. 30, 2019 Segment Store Location
Segment Information [Line Items] |
Number of reportable segments | Segment | 2
Birks Brand [Member] | Retail Segment [Member] |
Segment Information [Line Items] |
Number of retail stores | Store | 26
Brinkhaus Brand [Member] | Retail Segment [Member] |
Segment Information [Line Items] |
Number of retail locations | Location | 2

X
- Definition Number of retail locations. + References No definition available. + Details
Name: | bgi_NumberOfRetailLocations
Namespace Prefix: | bgi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Segment Information [Line Items] + References No definition available. + Details
Name: | bgi_SegmentInformationLineItems
Namespace Prefix: | bgi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of stores. + References No definition available. + Details
Name: | us-gaap_NumberOfStores
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_StatementGeographicalAxis=bgi_BirksBrandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=bgi_RetailSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=bgi_BrinkhausBrandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |