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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