2.4.0.6 Html 22 98 1 true 25 0 false 2 false false R1.htm 00101 - Document - Document And Entity Information {Elements} Sheet http://www.principalfunds.com/role/DocumentDocumentandEntityInformation Document And Entity Information false true R2.htm 01102 - Document - Risk/Return Summary {Unlabeled} (Global Multi-Strategy Fund) Sheet http://www.principalfunds.com/role/RiskReturn_S000033960Member Risk/Return Summary (Global Multi-Strategy Fund) false false R7.htm 040000 - Disclosure - Risk/Return Detail Data {Elements} Sheet http://xbrl.sec.gov/rr/role/RiskReturnDetailData Risk/Return Detail Data false true R8.htm 06108 - Document - Risk/Return Summary {Unlabeled} (Opportunistic Municipal Fund) Sheet http://www.principalfunds.com/role/RiskReturn_S000037379Member Risk/Return Summary (Opportunistic Municipal Fund) false false R13.htm 06113 - Disclosure - Risk/Return Detail Data {Elements} (Opportunistic Municipal Fund) Sheet http://www.principalfunds.com/role/RiskReturnDetailData_S000037379Member Risk/Return Detail Data (Opportunistic Municipal Fund) false true R14.htm 06114 - Document - Risk/Return Summary {Unlabeled} (Small-MidCap Dividend Income Fund) Sheet http://www.principalfunds.com/role/RiskReturn_S000032942Member Risk/Return Summary (Small-MidCap Dividend Income Fund) false false R19.htm 06119 - Disclosure - Risk/Return Detail Data {Elements} (Small-MidCap Dividend Income Fund) Sheet http://www.principalfunds.com/role/RiskReturnDetailData_S000032942Member Risk/Return Detail Data (Small-MidCap Dividend Income Fund) false true R20.htm 06120 - Document - Risk/Return Summary {Unlabeled} (Bond Market Index Fund) Sheet http://www.principalfunds.com/role/RiskReturn_S000027178Member Risk/Return Summary (Bond Market Index Fund) false false R27.htm 06127 - Disclosure - Risk/Return Detail Data {Elements} (Bond Market Index Fund) Sheet http://www.principalfunds.com/role/RiskReturnDetailData_S000027178Member Risk/Return Detail Data (Bond Market Index Fund) false true R28.htm 06128 - Document - Risk/Return Summary {Unlabeled} (Preferred Securities Fund) Sheet http://www.principalfunds.com/role/RiskReturn_S000007170Member Risk/Return Summary (Preferred Securities Fund) false false R35.htm 06135 - Disclosure - Risk/Return Detail Data {Elements} (Preferred Securities Fund) Sheet http://www.principalfunds.com/role/RiskReturnDetailData_S000007170Member Risk/Return Detail Data (Preferred Securities Fund) false true R36.htm 06136 - Document - Risk/Return Summary {Unlabeled} (Blue Chip Fund) Sheet http://www.principalfunds.com/role/RiskReturn_S000037378Member Risk/Return Summary (Blue Chip Fund) false false R39.htm 06139 - Disclosure - Risk/Return Detail Data {Elements} (Blue Chip Fund) Sheet http://www.principalfunds.com/role/RiskReturnDetailData_S000037378Member Risk/Return Detail Data (Blue Chip Fund) true false All Reports Book All Reports ck0000898745-20110831.xml ck0000898745-20110831.xsd ck0000898745-20110831_cal.xml ck0000898745-20110831_def.xml ck0000898745-20110831_lab.xml ck0000898745-20110831_pre.xml BarChart1.jpg BarChart2.jpg true true