3.7.0.1 html 277 105 1 true 174 0 false 2 false false R1.htm 000000 - Document - Document and Entity Information {Elements} Sheet http://www.bmofunds.com/role/DocumentDocumentandEntityInformationElements Document and Entity Information 1 false true R2.htm 000011 - Document - Risk/Return Summary {Unlabeled} - BMO Low Volatility Equity Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOLowVolatilityEquityFund Risk/Return Summary- BMO Low Volatility Equity Fund 2 false false R9.htm 000019 - Disclosure - Risk/Return Detail Data {Elements} - BMO Low Volatility Equity Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOLowVolatilityEquityFund Risk/Return Detail Data- BMO Low Volatility Equity Fund 3 false true R10.htm 000021 - Document - Risk/Return Summary {Unlabeled} - BMO Dividend Income Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMODividendIncomeFund Risk/Return Summary- BMO Dividend Income Fund 4 false false R17.htm 000029 - Disclosure - Risk/Return Detail Data {Elements} - BMO Dividend Income Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMODividendIncomeFund Risk/Return Detail Data- BMO Dividend Income Fund 5 false true R18.htm 000031 - Document - Risk/Return Summary {Unlabeled} - BMO Large-Cap Value Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOLarge-CapValueFund Risk/Return Summary- BMO Large-Cap Value Fund 6 false false R25.htm 000039 - Disclosure - Risk/Return Detail Data {Elements} - BMO Large-Cap Value Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOLarge-CapValueFund Risk/Return Detail Data- BMO Large-Cap Value Fund 7 false true R26.htm 000041 - Document - Risk/Return Summary {Unlabeled} - BMO Large-Cap Growth Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOLarge-CapGrowthFund Risk/Return Summary- BMO Large-Cap Growth Fund 8 false false R33.htm 000049 - Disclosure - Risk/Return Detail Data {Elements} - BMO Large-Cap Growth Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOLarge-CapGrowthFund Risk/Return Detail Data- BMO Large-Cap Growth Fund 9 false true R34.htm 000051 - Document - Risk/Return Summary {Unlabeled} - BMO Mid-Cap Value Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOMid-CapValueFund Risk/Return Summary- BMO Mid-Cap Value Fund 10 false false R41.htm 000059 - Disclosure - Risk/Return Detail Data {Elements} - BMO Mid-Cap Value Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOMid-CapValueFund Risk/Return Detail Data- BMO Mid-Cap Value Fund 11 false true R42.htm 000061 - Document - Risk/Return Summary {Unlabeled} - BMO Mid-Cap Growth Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOMid-CapGrowthFund Risk/Return Summary- BMO Mid-Cap Growth Fund 12 false false R49.htm 000069 - Disclosure - Risk/Return Detail Data {Elements} - BMO Mid-Cap Growth Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOMid-CapGrowthFund Risk/Return Detail Data- BMO Mid-Cap Growth Fund 13 false true R50.htm 000071 - Document - Risk/Return Summary {Unlabeled} - BMO Small-Cap Value Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOSmall-CapValueFund Risk/Return Summary- BMO Small-Cap Value Fund 14 false false R57.htm 000079 - Disclosure - Risk/Return Detail Data {Elements} - BMO Small-Cap Value Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOSmall-CapValueFund Risk/Return Detail Data- BMO Small-Cap Value Fund 15 false true R58.htm 000081 - Document - Risk/Return Summary {Unlabeled} - BMO Small-Cap Core Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOSmall-CapCoreFund Risk/Return Summary- BMO Small-Cap Core Fund 16 false false R65.htm 000089 - Disclosure - Risk/Return Detail Data {Elements} - BMO Small-Cap Core Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOSmall-CapCoreFund Risk/Return Detail Data- BMO Small-Cap Core Fund 17 false true R66.htm 000091 - Document - Risk/Return Summary {Unlabeled} - BMO Small-Cap Growth Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOSmall-CapGrowthFund Risk/Return Summary- BMO Small-Cap Growth Fund 18 false false R73.htm 000099 - Disclosure - Risk/Return Detail Data {Elements} - BMO Small-Cap Growth Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOSmall-CapGrowthFund Risk/Return Detail Data- BMO Small-Cap Growth Fund 19 false true R74.htm 000101 - Document - Risk/Return Summary {Unlabeled} - BMO Global Low Volatility Equity Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOGlobalLowVolatilityEquityFund Risk/Return Summary- BMO Global Low Volatility Equity Fund 20 false false R81.htm 000109 - Disclosure - Risk/Return Detail Data {Elements} - BMO Global Low Volatility Equity Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOGlobalLowVolatilityEquityFund Risk/Return Detail Data- BMO Global Low Volatility Equity Fund 21 false true R82.htm 000111 - Document - Risk/Return Summary {Unlabeled} - BMO Disciplined International Equity Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMODisciplinedInternationalEquityFund Risk/Return Summary- BMO Disciplined International Equity Fund 22 false false R87.htm 000119 - Disclosure - Risk/Return Detail Data {Elements} - BMO Disciplined International Equity Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMODisciplinedInternationalEquityFund Risk/Return Detail Data- BMO Disciplined International Equity Fund 23 false true R88.htm 000121 - Document - Risk/Return Summary {Unlabeled} - BMO Pyrford International Stock Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOPyrfordInternationalStockFund Risk/Return Summary- BMO Pyrford International Stock Fund 24 false false R95.htm 000129 - Disclosure - Risk/Return Detail Data {Elements} - BMO Pyrford International Stock Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOPyrfordInternationalStockFund Risk/Return Detail Data- BMO Pyrford International Stock Fund 25 false true R96.htm 000131 - Document - Risk/Return Summary {Unlabeled} - BMO LGM Emerging Markets Equity Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOLGMEmergingMarketsEquityFund Risk/Return Summary- BMO LGM Emerging Markets Equity Fund 26 false false R103.htm 000139 - Disclosure - Risk/Return Detail Data {Elements} - BMO LGM Emerging Markets Equity Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOLGMEmergingMarketsEquityFund Risk/Return Detail Data- BMO LGM Emerging Markets Equity Fund 27 false true R104.htm 000141 - Document - Risk/Return Summary {Unlabeled} - BMO TCH Emerging Markets Bond Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOTCHEmergingMarketsBondFund Risk/Return Summary- BMO TCH Emerging Markets Bond Fund 28 false false R111.htm 000149 - Disclosure - Risk/Return Detail Data {Elements} - BMO TCH Emerging Markets Bond Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOTCHEmergingMarketsBondFund Risk/Return Detail Data- BMO TCH Emerging Markets Bond Fund 29 false true R112.htm 000151 - Document - Risk/Return Summary {Unlabeled} - BMO Alternative Strategies Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOAlternativeStrategiesFund Risk/Return Summary- BMO Alternative Strategies Fund 30 false false R119.htm 000159 - Disclosure - Risk/Return Detail Data {Elements} - BMO Alternative Strategies Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOAlternativeStrategiesFund Risk/Return Detail Data- BMO Alternative Strategies Fund 31 false true R120.htm 000161 - Document - Risk/Return Summary {Unlabeled} - BMO Global Long/Short Equity Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOGlobalLongShortEquityFund Risk/Return Summary- BMO Global Long/Short Equity Fund 32 false false R125.htm 000169 - Disclosure - Risk/Return Detail Data {Elements} - BMO Global Long/Short Equity Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOGlobalLongShortEquityFund Risk/Return Detail Data- BMO Global Long/Short Equity Fund 33 false true R126.htm 000171 - Document - Risk/Return Summary {Unlabeled} - BMO Ultra Short Tax-Free Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOUltraShortTax-FreeFund Risk/Return Summary- BMO Ultra Short Tax-Free Fund 34 false false R133.htm 000179 - Disclosure - Risk/Return Detail Data {Elements} - BMO Ultra Short Tax-Free Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOUltraShortTax-FreeFund Risk/Return Detail Data- BMO Ultra Short Tax-Free Fund 35 false true R134.htm 000181 - Document - Risk/Return Summary {Unlabeled} - BMO Short Tax-Free Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOShortTax-FreeFund Risk/Return Summary- BMO Short Tax-Free Fund 36 false false R141.htm 000189 - Disclosure - Risk/Return Detail Data {Elements} - BMO Short Tax-Free Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOShortTax-FreeFund Risk/Return Detail Data- BMO Short Tax-Free Fund 37 false true R142.htm 000191 - Document - Risk/Return Summary {Unlabeled} - BMO Short-Term Income Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOShort-TermIncomeFund Risk/Return Summary- BMO Short-Term Income Fund 38 false false R149.htm 000199 - Disclosure - Risk/Return Detail Data {Elements} - BMO Short-Term Income Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOShort-TermIncomeFund Risk/Return Detail Data- BMO Short-Term Income Fund 39 false true R150.htm 000201 - Document - Risk/Return Summary {Unlabeled} - BMO Intermediate Tax-Free Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOIntermediateTax-FreeFund Risk/Return Summary- BMO Intermediate Tax-Free Fund 40 false false R157.htm 000209 - Disclosure - Risk/Return Detail Data {Elements} - BMO Intermediate Tax-Free Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOIntermediateTax-FreeFund Risk/Return Detail Data- BMO Intermediate Tax-Free Fund 41 false true R158.htm 000211 - Document - Risk/Return Summary {Unlabeled} - BMO Strategic Income Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOStrategicIncomeFund Risk/Return Summary- BMO Strategic Income Fund 42 false false R165.htm 000219 - Disclosure - Risk/Return Detail Data {Elements} - BMO Strategic Income Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOStrategicIncomeFund Risk/Return Detail Data- BMO Strategic Income Fund 43 false true R166.htm 000221 - Document - Risk/Return Summary {Unlabeled} - BMO TCH Intermediate Income Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOTCHIntermediateIncomeFund Risk/Return Summary- BMO TCH Intermediate Income Fund 44 false false R173.htm 000229 - Disclosure - Risk/Return Detail Data {Elements} - BMO TCH Intermediate Income Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOTCHIntermediateIncomeFund Risk/Return Detail Data- BMO TCH Intermediate Income Fund 45 false true R174.htm 000231 - Document - Risk/Return Summary {Unlabeled} - BMO TCH Corporate Income Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOTCHCorporateIncomeFund Risk/Return Summary- BMO TCH Corporate Income Fund 46 false false R181.htm 000239 - Disclosure - Risk/Return Detail Data {Elements} - BMO TCH Corporate Income Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOTCHCorporateIncomeFund Risk/Return Detail Data- BMO TCH Corporate Income Fund 47 false true R182.htm 000241 - Document - Risk/Return Summary {Unlabeled} - BMO TCH Core Plus Bond Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOTCHCorePlusBondFund Risk/Return Summary- BMO TCH Core Plus Bond Fund 48 false false R189.htm 000249 - Disclosure - Risk/Return Detail Data {Elements} - BMO TCH Core Plus Bond Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOTCHCorePlusBondFund Risk/Return Detail Data- BMO TCH Core Plus Bond Fund 49 false true R190.htm 000251 - Document - Risk/Return Summary {Unlabeled} - BMO High Yield Bond Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOHighYieldBondFund Risk/Return Summary- BMO High Yield Bond Fund 50 false false R197.htm 000259 - Disclosure - Risk/Return Detail Data {Elements} - BMO High Yield Bond Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOHighYieldBondFund Risk/Return Detail Data- BMO High Yield Bond Fund 51 false true R198.htm 000261 - Document - Risk/Return Summary {Unlabeled} - BMO Government Money Market Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOGovernmentMoneyMarketFund Risk/Return Summary- BMO Government Money Market Fund 52 false false R205.htm 000269 - Disclosure - Risk/Return Detail Data {Elements} - BMO Government Money Market Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOGovernmentMoneyMarketFund Risk/Return Detail Data- BMO Government Money Market Fund 53 false true R206.htm 000271 - Document - Risk/Return Summary {Unlabeled} - BMO Tax-Free Money Market Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOTax-FreeMoneyMarketFund Risk/Return Summary- BMO Tax-Free Money Market Fund 54 false false R213.htm 000279 - Disclosure - Risk/Return Detail Data {Elements} - BMO Tax-Free Money Market Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOTax-FreeMoneyMarketFund Risk/Return Detail Data- BMO Tax-Free Money Market Fund 55 false true R214.htm 000281 - Document - Risk/Return Summary {Unlabeled} - BMO Prime Money Market Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOPrimeMoneyMarketFund Risk/Return Summary- BMO Prime Money Market Fund 56 false false R221.htm 000289 - Disclosure - Risk/Return Detail Data {Elements} - BMO Prime Money Market Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOPrimeMoneyMarketFund Risk/Return Detail Data- BMO Prime Money Market Fund 57 false true R222.htm 000291 - Document - Risk/Return Summary {Unlabeled} - BMO Institutional Prime Money Market Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOInstitutionalPrimeMoneyMarketFund Risk/Return Summary- BMO Institutional Prime Money Market Fund 58 false false R227.htm 000299 - Disclosure - Risk/Return Detail Data {Elements} - BMO Institutional Prime Money Market Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOInstitutionalPrimeMoneyMarketFund Risk/Return Detail Data- BMO Institutional Prime Money Market Fund 59 false false R228.htm 040000 - Disclosure - Risk/Return Detail Data {Elements} Sheet http://xbrl.sec.gov/rr/role/RiskReturnDetailData Risk/Return Detail Data 60 false false All Reports Book All Reports bmo-20170601.xml bmo-20170601.xsd bmo-20170601_cal.xml bmo-20170601_def.xml bmo-20170601_lab.xml bmo-20170601_pre.xml BarChart1.png BarChart2.png BarChart3.png BarChart4.png BarChart5.png BarChart6.png BarChart7.png BarChart8.png BarChart9.png BarChart10.png BarChart11.png BarChart12.png BarChart13.png BarChart14.png BarChart15.png BarChart16.png BarChart17.png BarChart18.png BarChart19.png BarChart20.png BarChart21.png BarChart22.png BarChart23.png BarChart24.png BarChart25.png BarChart26.png true true