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Segmented Information - Schedule of Sales to External Customers and Long-Lived Assets by Geographical Areas (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Mar. 30, 2013 | Mar. 31, 2012 | Mar. 26, 2011
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net sales, total | $ 292,759 | $ 302,317 | $ 270,948
Long-lived assets, total | 28,929 | 28,135 | 27,598
Net Sales, total | 292,759 | 302,317 | 270,948
Canada [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net sales, total | 158,834 | 163,027 | 144,903
Long-lived assets, total | 18,966 | 20,330 | 20,232
Net Sales, total | 158,834 | 163,027 | 144,903
United States [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net sales, total | 133,925 | 139,290 | 126,045
Long-lived assets, total | 9,963 | 7,805 | 7,366
Net Sales, total | 133,925 | 139,290 | 126,045
Jewelry and Other [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net sales, total | 164,492 | 172,487 | 159,306
Net Sales, total | 164,492 | 172,487 | 159,306
Timepieces [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net sales, total | 128,267 | 129,830 | 111,642
Net Sales, total | $ 128,267 | $ 129,830 | $ 111,642

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- Definition Segment Reporting Information Long Lived Assets + References No definition available. + Details
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Namespace Prefix: | bmj_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration