2.4.0.8149 - Disclosure - Bank Indebtedness - Summary of Company's Senior Credit Facility (Detail)truefalsefalse1false USDfalsefalse$eol_PE376591--1320-F0001_STD_364_20130330_0_574857x649035http://www.sec.gov/CIK0001179821duration2012-04-01T00:00:002013-03-30T00:00:00iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170pureStandardhttp://www.xbrl.org/2003/instancepure0USDUSD$2false USDfalsefalse$eol_PE376591--1320-F0001_STD_371_20120331_0_574857x649035http://www.sec.gov/CIK0001179821duration2011-03-27T00:00:002012-03-31T00:00:00iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170pureStandardhttp://www.xbrl.org/2003/instancepure0USDUSD$1false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse1false USDtruefalse$eol_PE376591--1320-F0001_STD_364_20130330_0_574857x649035http://www.sec.gov/CIK0001179821duration2012-04-01T00:00:002013-03-30T00:00:00falsefalseSenior Secured Notes [Member]us-gaap_LineOfCreditFacilityAxisxbrldihttp://xbrl.org/2006/xbrldibmj_SeniorSecuredNotesMemberus-gaap_LineOfCreditFacilityAxisexplicitMemberiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170pureStandardhttp://www.xbrl.org/2003/instancepure0USDUSD$nanafalse0Senior Secured Notes [Member]2true 3bmj_CreditFacilitiesLineItemsbmj_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Credit Facilities [Line Items]3false 4us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriodus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse100548000100548000USD$falsetruefalse2truefalsefalse8814300088143000USD$falsetruefalsexbrli:monetaryItemTypemonetaryMaximum amount borrowed under the credit facility at any time during the period.No definition available.false2Maximum borrowing outstanding during the year4false 4us-gaap_LineOfCreditFacilityAverageOutstandingAmountus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse7837100078371000USD$falsetruefalse2truefalsefalse7104500071045000USD$falsetruefalsexbrli:monetaryItemTypemonetaryAverage amount borrowed under the credit facility during the period.No definition available.false2Average outstanding balance during the year5false 4us-gaap_DebtWeightedAverageInterestRateus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.0360.036falsefalsefalse2truetruefalse0.0360.036falsefalsefalsenum:percentItemTypepureReflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding by type or by instrument at that time.No definition available.false0Weighted average interest rate for the year6false 4us-gaap_LineOfCreditFacilityInterestRateAtPeriodEndus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.0360.036falsefalsefalse2truetruefalse0.0360.036falsefalsefalsenum:percentItemTypepureThe effective interest rate at the end of the reporting period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 false0Effective interest rate at year-endfalseBank Indebtedness - Summary of Company's Senior Credit Facility (Detail) (Senior Secured Notes [Member], USD $)NoRoundingUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.birksandmayors.com/taxonomy/role/DisclosureBankIndebtednessSummaryOfCompanysSeniorCreditFacility26