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Property and Equipment - Additional Information (Detail) (Property and equipment [Member], USD $) In Millions, unless otherwise specified	Mar. 30, 2013	Mar. 31, 2012
Property and equipment [Member]
Depreciation and Amortization Expenses For Property Plant And Equipment [Line Items]
Property and plant under capital lease arrangement, cost	$ 13.7	$ 19.5
Property and plant under capital lease arrangement, net book value	$ 8.1	$ 11.0

X

- Definition

Capital Lease Cost Of Asset

+ References

No definition available.

+ Details

Name:	bmj_CapitalLeaseCostOfAsset
Namespace Prefix:	bmj_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	bmj_DepreciationAndAmortizationExpensesForPropertyPlantAndEquipmentLineItems
Namespace Prefix:	bmj_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The total gross amount less the charge for the use of the long-lived depreciable assets subject to a lease meeting the criteria for capitalization.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant