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v2.4.0.8

Segmented Information - Additional Information (Detail) | 12 Months Ended
--- | ---
Mar. 30, 2013 Segment
Segment Information [Line Items] |
Number of reportable segment | 2
Birks Brand [Member] | Retail Segment [Member] |
Segment Information [Line Items] |
Number of retail stores | 30
Mayors Brand [Member] | Retail Segment [Member] |
Segment Information [Line Items] |
Number of retail stores | 20
Rolex Brand [Member] | Retail Segment [Member] |
Segment Information [Line Items] |
Number of retail stores | 1
Brinkhaus Brand [Member] | Retail Segment [Member] |
Segment Information [Line Items] |
Number of retail locations | 2

X
- Definition Number Of Retail Locations + References No definition available. + Details
Name: | bmj_NumberOfRetailLocations
Namespace Prefix: | bmj_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | bmj_SegmentInformationLineItems
Namespace Prefix: | bmj_
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