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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 |  |

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- Definition Bank Indebtedness + References No definition available. + Details
Name: | bmj_BankIndebtedness
Namespace Prefix: | bmj_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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

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- 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

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

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- 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
Name: | us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
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