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Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 30, 2013	Mar. 31, 2012	Mar. 26, 2011
Fair Value Disclosures [Abstract]
Percentage of consolidated sale	28.00%	26.00%	24.00%
Bank indebtedness	$ 67.3
Long-term debt bearing interest at variable rates	8.2
Fixed-rate long-term debt	33.7
Fair value of fixed long-term debt and other long-term liabilities	36.3
Remaining fixed-rate long term debt	$ 18

X

- Definition

Bank Indebtedness

+ References

No definition available.

+ Details

Name:	bmj_BankIndebtedness
Namespace Prefix:	bmj_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Percent Of Consolidated Net Sales

+ References

No definition available.

+ Details

Name:	bmj_PercentOfConsolidatedNetSales
Namespace Prefix:	bmj_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Variable Rate Debt Fair value

+ References

No definition available.

+ Details

Name:	bmj_VariableRateDebtFairValue
Namespace Prefix:	bmj_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_FairValueDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

Name:	us-gaap_LiabilitiesFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

No definition available.

+ Details

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

X

- Definition

The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

+ References

No definition available.

+ Details

Name:	us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant