2.4.1.9 Html 184 99 1 true 144 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 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 false false R8.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 false true R9.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 false false R15.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 false true R16.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 false false R22.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 false true R23.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 false false R29.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 false true R30.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 false false R36.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 false true R37.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 false false R43.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 false true R44.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 false false R50.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 false true R51.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 false false R55.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 false true R56.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 false false R62.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 false true R63.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 false false R67.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 false true R68.htm 000111 - Document - Risk/Return Summary {Unlabeled} - BMO Pyrford Global Equity Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOPyrfordGlobalEquityFund Risk/Return Summary - BMO Pyrford Global Equity Fund false false R72.htm 000119 - Disclosure - Risk/Return Detail Data {Elements} - BMO Pyrford Global Equity Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOPyrfordGlobalEquityFund Risk/Return Detail Data - BMO Pyrford Global Equity Fund false true R73.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 false false R79.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 false true R80.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 false false R86.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 false true R87.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 false false R91.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 false true R92.htm 000151 - 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 false false R98.htm 000159 - 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 false true R99.htm 000161 - 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 false false R105.htm 000169 - 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 false true R106.htm 000171 - 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 false false R112.htm 000179 - 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 false true R113.htm 000181 - 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 false false R119.htm 000189 - 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 false true R120.htm 000191 - Document - Risk/Return Summary {Unlabeled} - BMO Mortgage Income Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOMortgageIncomeFund Risk/Return Summary - BMO Mortgage Income Fund false false R126.htm 000199 - Disclosure - Risk/Return Detail Data {Elements} - BMO Mortgage Income Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOMortgageIncomeFund Risk/Return Detail Data - BMO Mortgage Income Fund false true R127.htm 000201 - 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 false false R133.htm 000209 - 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 false true R134.htm 000211 - 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 false false R140.htm 000219 - 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 false true R141.htm 000221 - 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 false false R147.htm 000229 - 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 false true R148.htm 000231 - Document - Risk/Return Summary {Unlabeled} - BMO Monegy High Yield Bond Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOMonegyHighYieldBondFund Risk/Return Summary - BMO Monegy High Yield Bond Fund false false R154.htm 000239 - Disclosure - Risk/Return Detail Data {Elements} - BMO Monegy High Yield Bond Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOMonegyHighYieldBondFund Risk/Return Detail Data - BMO Monegy High Yield Bond Fund false true R155.htm 000241 - Document - Risk/Return Summary {Unlabeled} - BMO Multi-Asset Income Fund Sheet http://www.bmofunds.com/role/DocumentRiskReturnSummaryUnlabeledBMOMulti-AssetIncomeFund Risk/Return Summary - BMO Multi-Asset Income Fund false false R159.htm 000249 - Disclosure - Risk/Return Detail Data {Elements} - BMO Multi-Asset Income Fund Sheet http://www.bmofunds.com/role/DisclosureRiskReturnDetailDataElementsBMOMulti-AssetIncomeFund Risk/Return Detail Data - BMO Multi-Asset Income Fund false true R160.htm 000251 - 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 false false R166.htm 000259 - 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 false true R167.htm 000261 - 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 false false R173.htm 000269 - 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 false true R174.htm 000271 - 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 false false R180.htm 000279 - 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 false false R181.htm 040000 - Disclosure - Risk/Return Detail Data {Elements} Sheet http://xbrl.sec.gov/rr/role/RiskReturnDetailData Risk/Return Detail Data true false All Reports Book All Reports bmo-20150601.xml bmo-20150601.xsd bmo-20150601_cal.xml bmo-20150601_def.xml bmo-20150601_lab.xml bmo-20150601_pre.xml BarChart1.jpg BarChart2.jpg BarChart3.jpg BarChart4.jpg BarChart5.jpg BarChart6.jpg BarChart7.jpg BarChart8.jpg BarChart9.jpg BarChart10.jpg BarChart11.jpg BarChart12.jpg BarChart13.jpg BarChart14.jpg BarChart15.jpg BarChart16.jpg BarChart17.jpg BarChart18.jpg BarChart19.jpg BarChart20.jpg BarChart21.jpg BarChart22.jpg true true