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Label Element Value
Prospectus: rr_ProspectusTable  
Document Type dei_DocumentType 497
Document Period End Date dei_DocumentPeriodEndDate Oct. 31, 2015
Entity Registrant Name dei_EntityRegistrantName PRINCIPAL FUNDS INC
Central Index Key dei_EntityCentralIndexKey 0000898745
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Mar. 09, 2016
Document Effective Date dei_DocumentEffectiveDate Mar. 09, 2016
Prospectus Date rr_ProspectusDate Mar. 01, 2016
Supplement [Text Block] ck0000898745_SupplementTextBlock
Principal Funds, Inc.
Supplement dated March 9, 2016
to the Statutory Prospectus dated March 1, 2016
This supplement updates information contained in the Statutory Prospectus. Please retain this supplement for future reference.
Principal LifeTime Hybrid Income Fund  
Prospectus: rr_ProspectusTable  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME HYBRID INCOME FUND
Expense [Heading] rr_ExpenseHeading In the Annual Fund Operating Expenses section, replace the table with the following:
Expense Example [Heading] rr_ExpenseExampleHeading In the Example section, replace the table with the following:
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading In the Performance section, replace the last row in the Average Annual Total Returns table with the following:
Principal LifeTime Hybrid Income Fund | S&P Target Date Retirement Income Index [Member]  
Prospectus: rr_ProspectusTable  
Label rr_AverageAnnualReturnLabel S&P Target Date Retirement Income Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 (0.18%)
Since Inception rr_AverageAnnualReturnSinceInception 1.05%
Principal LifeTime Hybrid Income Fund | Principal LifeTime Hybrid Income Fund, Institutional Class  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 34.60%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.48%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 35.08%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (34.55%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.53%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 54
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 5,109
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 7,902
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 10,127
Principal LifeTime Hybrid Income Fund | Principal LifeTime Hybrid Income Fund, R-3  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 16.53% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.48%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 17.26%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (16.16%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.10%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 112
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 3,082
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 5,587
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 9,609
Principal LifeTime Hybrid Income Fund | Principal LifeTime Hybrid Income Fund, R-5  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 16.47% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.48%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 16.95%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (16.16%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.79%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 81
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 3,011
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 5,504
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 9,553
Principal LifeTime Hybrid Income Fund | Principal LifeTime Hybrid Income Fund, R-6  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 16.28% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.48%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 16.76%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (16.26%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.50%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 51
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 2,958
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 5,446
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 9,516
Principal LifeTime Hybrid 2015 Fund  
Prospectus: rr_ProspectusTable  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME HYBRID 2015 FUND
Expense [Heading] rr_ExpenseHeading In the Annual Fund Operating Expenses section, replace the table with the following:
Expense Example [Heading] rr_ExpenseExampleHeading In the Example section, replace the table with the following:
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading In the Performance section, replace the last row in the Average Annual Total Returns table with the following:
Principal LifeTime Hybrid 2015 Fund | S&P Target Date 2015 Index [Member]  
Prospectus: rr_ProspectusTable  
Label rr_AverageAnnualReturnLabel S&P Target Date 2015 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 (0.16%)
Since Inception rr_AverageAnnualReturnSinceInception 1.34%
Principal LifeTime Hybrid 2015 Fund | Principal LifeTime Hybrid 2015 Fund, Institutional Class  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 5.45%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.43%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 5.88%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (5.40%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.48%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 49
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,184
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 2,392
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 5,319
Principal LifeTime Hybrid 2015 Fund | Principal LifeTime Hybrid 2015 Fund, R-3  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 2.90% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.43%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 3.58%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (2.53%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.05%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 107
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 821
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,601
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 3,649
Principal LifeTime Hybrid 2015 Fund | Principal LifeTime Hybrid 2015 Fund, R-5  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 2.84% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.43%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 3.27%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (2.53%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.74%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 76
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 728
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,449
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 3,363
Principal LifeTime Hybrid 2015 Fund | Principal LifeTime Hybrid 2015 Fund, R-6  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 2.65% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.43%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 3.08%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (2.63%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.45%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 46
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 660
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,344
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 3,175
Principal LifeTime Hybrid 2020 Fund  
Prospectus: rr_ProspectusTable  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME HYBRID 2020 FUND
Expense [Heading] rr_ExpenseHeading In the Annual Fund Operating Expenses section, replace the table with the following:
Expense Example [Heading] rr_ExpenseExampleHeading In the Example section, replace the table with the following:
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading In the Performance section, replace the last row in the Average Annual Total Returns table with the following:
Principal LifeTime Hybrid 2020 Fund | S&P Target Date 2020 Index [Member]  
Prospectus: rr_ProspectusTable  
Label rr_AverageAnnualReturnLabel S&P Target Date 2020 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 (0.19%)
Since Inception rr_AverageAnnualReturnSinceInception 1.41%
Principal LifeTime Hybrid 2020 Fund | Principal LifeTime Hybrid 2020 Fund, Institutional Class  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 2.70%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.44%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 3.14%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (2.65%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.49%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 50
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 676
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,372
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 3,230
Principal LifeTime Hybrid 2020 Fund | Principal LifeTime Hybrid 2020 Fund, R-3  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 1.59% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.44%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.28%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.22%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.06%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 108
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 575
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,090
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,504
Principal LifeTime Hybrid 2020 Fund | Principal LifeTime Hybrid 2020 Fund, R-5  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 1.53% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.44%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.97%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.22%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.75%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 77
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 480
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 930
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,180
Principal LifeTime Hybrid 2020 Fund | Principal LifeTime Hybrid 2020 Fund, R-6  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 1.34% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.44%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.78%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.32%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.46%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 47
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 409
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 819
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,966
Principal LifeTime Hybrid 2025 Fund  
Prospectus: rr_ProspectusTable  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME HYBRID 2025 FUND
Expense [Heading] rr_ExpenseHeading In the Annual Fund Operating Expenses section, replace the table with the following:
Expense Example [Heading] rr_ExpenseExampleHeading In the Example section, replace the table with the following:
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading In the Performance section, replace the last row in the Average Annual Total Returns table with the following:
Principal LifeTime Hybrid 2025 Fund | S&P Target Date 2025 Index [Member]  
Prospectus: rr_ProspectusTable  
Label rr_AverageAnnualReturnLabel S&P Target Date 2025 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 (0.25%)
Since Inception rr_AverageAnnualReturnSinceInception 1.31%
Principal LifeTime Hybrid 2025 Fund | Principal LifeTime Hybrid 2025 Fund, Institutional Class  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 6.35%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.46%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 6.81%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (6.30%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.51%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 52
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,354
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 2,716
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 5,909
Principal LifeTime Hybrid 2025 Fund | Principal LifeTime Hybrid 2025 Fund, R-3  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 3.32% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.46%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 4.03%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (2.95%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.08%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 110
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 909
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,775
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 4,016
Principal LifeTime Hybrid 2025 Fund | Principal LifeTime Hybrid 2025 Fund, R-5  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 3.26% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.46%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 3.72%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (2.95%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.77%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 79
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 817
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,626
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 3,742
Principal LifeTime Hybrid 2025 Fund | Principal LifeTime Hybrid 2025 Fund, R-6  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 3.07% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.46%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 3.53%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (3.05%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.48%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 49
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 749
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,523
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 3,562
Principal LifeTime Hybrid 2030 Fund  
Prospectus: rr_ProspectusTable  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME HYBRID 2030 FUND
Expense [Heading] rr_ExpenseHeading In the Annual Fund Operating Expenses section, replace the table with the following:
Expense Example [Heading] rr_ExpenseExampleHeading In the Example section, replace the table with the following:
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading In the Performance section, replace the last row in the Average Annual Total Returns table with the following:
Principal LifeTime Hybrid 2030 Fund | S&P Target Date 2030 Index [Member]  
Prospectus: rr_ProspectusTable  
Label rr_AverageAnnualReturnLabel S&P Target Date 2030 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 (0.30%)
Since Inception rr_AverageAnnualReturnSinceInception 1.32%
Principal LifeTime Hybrid 2030 Fund | Principal LifeTime Hybrid 2030 Fund, Institutional Class  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 3.60%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.45%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 4.05%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (3.55%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.50%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 51
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 849
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,725
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 3,988
Principal LifeTime Hybrid 2030 Fund | Principal LifeTime Hybrid 2030 Fund, R-3  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 2.02% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.45%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.72%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.65%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.07%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 109
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 661
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,267
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,909
Principal LifeTime Hybrid 2030 Fund | Principal LifeTime Hybrid 2030 Fund, R-5  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 1.96% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.45%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.41%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.65%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.76%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 78
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 566
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,110
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,598
Principal LifeTime Hybrid 2030 Fund | Principal LifeTime Hybrid 2030 Fund, R-6  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 1.77% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.45%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.22%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.75%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.47%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 48
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 496
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,002
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,393
Principal LifeTime Hybrid 2035 Fund  
Prospectus: rr_ProspectusTable  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME HYBRID 2035 FUND
Expense [Heading] rr_ExpenseHeading In the Annual Fund Operating Expenses section, replace the table with the following:
Expense Example [Heading] rr_ExpenseExampleHeading In the Example section, replace the table with the following:
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading In the Performance section, replace the last row in the Average Annual Total Returns table with the following:
Principal LifeTime Hybrid 2035 Fund | S&P Target Date 2035 Index [Member]  
Prospectus: rr_ProspectusTable  
Label rr_AverageAnnualReturnLabel S&P Target Date 2035 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 (0.35%)
Since Inception rr_AverageAnnualReturnSinceInception 1.33%
Principal LifeTime Hybrid 2035 Fund | Principal LifeTime Hybrid 2035 Fund, Institutional Class  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 5.36%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.48%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 5.84%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (5.31%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.53%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 54
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,182
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 2,382
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 5,295
Principal LifeTime Hybrid 2035 Fund | Principal LifeTime Hybrid 2035 Fund, R-3  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 2.86% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.48%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 3.59%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (2.49%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.10%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 112
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 829
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,610
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 3,661
Principal LifeTime Hybrid 2035 Fund | Principal LifeTime Hybrid 2035 Fund, R-5  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 2.80% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.48%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 3.28%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (2.49%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.79%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 81
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 736
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,458
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 3,376
Principal LifeTime Hybrid 2035 Fund | Principal LifeTime Hybrid 2035 Fund, R-6  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 2.61% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.48%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 3.09%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (2.59%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.50%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 51
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 667
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,354
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 3,188
Principal LifeTime Hybrid 2040 Fund  
Prospectus: rr_ProspectusTable  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME HYBRID 2040 FUND
Expense [Heading] rr_ExpenseHeading In the Annual Fund Operating Expenses section, replace the table with the following:
Expense Example [Heading] rr_ExpenseExampleHeading In the Example section, replace the table with the following:
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading In the Performance section, replace the last row in the Average Annual Total Returns table with the following:
Principal LifeTime Hybrid 2040 Fund | S&P Target Date 2040 Index [Member]  
Prospectus: rr_ProspectusTable  
Label rr_AverageAnnualReturnLabel S&P Target Date 2040 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 (0.40%)
Since Inception rr_AverageAnnualReturnSinceInception 1.30%
Principal LifeTime Hybrid 2040 Fund | Principal LifeTime Hybrid 2040 Fund, Institutional Class  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 6.93%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.44%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 7.37%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (6.88%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.49%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 50
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,452
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 2,902
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 6,237
Principal LifeTime Hybrid 2040 Fund | Principal LifeTime Hybrid 2040 Fund, R-3  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 3.60% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.44%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 4.29%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (3.23%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.06%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 108
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 955
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,871
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 4,217
Principal LifeTime Hybrid 2040 Fund | Principal LifeTime Hybrid 2040 Fund, R-5  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 3.54% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.44%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 3.98%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (3.23%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.75%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 77
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 863
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,723
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 3,951
Principal LifeTime Hybrid 2040 Fund | Principal LifeTime Hybrid 2040 Fund, R-6  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 3.35% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.44%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 3.79%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (3.33%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.46%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 47
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 796
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,621
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 3,775
Principal LifeTime Hybrid 2045 Fund  
Prospectus: rr_ProspectusTable  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME HYBRID 2045 FUND
Expense [Heading] rr_ExpenseHeading In the Annual Fund Operating Expenses section, replace the table with the following:
Expense Example [Heading] rr_ExpenseExampleHeading In the Example section, replace the table with the following:
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading In the Performance section, replace the last row in the Average Annual Total Returns table with the following:
Principal LifeTime Hybrid 2045 Fund | S&P Target Date 2045 Index [Member]  
Prospectus: rr_ProspectusTable  
Label rr_AverageAnnualReturnLabel S&P Target Date 2045 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 (0.46%)
Since Inception rr_AverageAnnualReturnSinceInception 1.26%
Principal LifeTime Hybrid 2045 Fund | Principal LifeTime Hybrid 2045 Fund, Institutional Class  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 9.13%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.48%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 9.61%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (9.08%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.53%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 54
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,841
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 3,612
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 7,372
Principal LifeTime Hybrid 2045 Fund | Principal LifeTime Hybrid 2045 Fund, R-3  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 4.64% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.48%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 5.37%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (4.27%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.10%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 112
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,158
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 2,269
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 5,011
Principal LifeTime Hybrid 2045 Fund | Principal LifeTime Hybrid 2045 Fund, R-5  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 4.58% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.48%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 5.06%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (4.27%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.79%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 81
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,068
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 2,128
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 4,772
Principal LifeTime Hybrid 2045 Fund | Principal LifeTime Hybrid 2045 Fund, R-6  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 4.39% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.48%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 4.87%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (4.37%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.50%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 51
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,002
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 2,031
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 4,615
Principal LifeTime Hybrid 2050 Fund  
Prospectus: rr_ProspectusTable  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME HYBRID 2050 FUND
Expense [Heading] rr_ExpenseHeading In the Annual Fund Operating Expenses section, replace the table with the following:
Expense Example [Heading] rr_ExpenseExampleHeading In the Example section, replace the table with the following:
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading In the Performance section, replace the last row in the Average Annual Total Returns table with the following:
Principal LifeTime Hybrid 2050 Fund | S&P Target Date 2050 Index [Member]  
Prospectus: rr_ProspectusTable  
Label rr_AverageAnnualReturnLabel S&P Target Date 2050 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 (0.47%)
Since Inception rr_AverageAnnualReturnSinceInception 1.29%
Principal LifeTime Hybrid 2050 Fund | Principal LifeTime Hybrid 2050 Fund, Institutional Class  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 12.41%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.47%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 12.88%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (12.36%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.52%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 53
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 2,373
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 4,527
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 8,589
Principal LifeTime Hybrid 2050 Fund | Principal LifeTime Hybrid 2050 Fund, R-3  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 6.18% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.47%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 6.90%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (5.81%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.09%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 111
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,431
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 2,798
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 5,994
Principal LifeTime Hybrid 2050 Fund | Principal LifeTime Hybrid 2050 Fund, R-5  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 6.12% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.47%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 6.59%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (5.81%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.78%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 80
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,344
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 2,665
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 5,790
Principal LifeTime Hybrid 2050 Fund | Principal LifeTime Hybrid 2050 Fund, R-6  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 5.93% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.47%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 6.40%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (5.91%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.49%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 50
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,279
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 2,574
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 5,656
Principal LifeTime Hybrid 2055 Fund  
Prospectus: rr_ProspectusTable  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME HYBRID 2055 FUND
Expense [Heading] rr_ExpenseHeading In the Annual Fund Operating Expenses section, replace the table with the following:
Expense Example [Heading] rr_ExpenseExampleHeading In the Example section, replace the table with the following:
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading In the Performance section, replace the last row in the Average Annual Total Returns table with the following:
Principal LifeTime Hybrid 2055 Fund | S&P Target Date 2055 Plus Index  
Prospectus: rr_ProspectusTable  
Label rr_AverageAnnualReturnLabel S&P Target Date 2055+ Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 (0.54%)
Since Inception rr_AverageAnnualReturnSinceInception 1.22%
Principal LifeTime Hybrid 2055 Fund | Principal LifeTime Hybrid 2055 Fund, Institutional Class  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 45.67%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.48%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 46.15%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (45.62%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.53%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 54
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 5,957
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 8,328
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 9,495
Principal LifeTime Hybrid 2055 Fund | Principal LifeTime Hybrid 2055 Fund, R-3  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 21.61% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.48%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 22.34%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (21.24%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.10%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 112
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 3,765
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 6,521
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 10,171
Principal LifeTime Hybrid 2055 Fund | Principal LifeTime Hybrid 2055 Fund, R-5  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 21.55% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.48%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 22.03%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (21.24%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.79%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 81
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 3,702
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 6,456
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 10,150
Principal LifeTime Hybrid 2055 Fund | Principal LifeTime Hybrid 2055 Fund, R-6  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 21.36% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.48%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 21.84%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (21.34%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.50%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 51
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 3,654
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 6,412
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 10,135
Principal LifeTime Hybrid 2060 Fund  
Prospectus: rr_ProspectusTable  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME HYBRID 2060 FUND
Expense [Heading] rr_ExpenseHeading In the Annual Fund Operating Expenses section, replace the table with the following:
Expense Example [Heading] rr_ExpenseExampleHeading In the Example section, replace the table with the following:
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading In the Performance section, replace the last row in the Average Annual Total Returns table with the following:
Principal LifeTime Hybrid 2060 Fund | S&P Target Date 2055 Plus Index  
Prospectus: rr_ProspectusTable  
Label rr_AverageAnnualReturnLabel S&P Target Date 2055+ Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 (0.54%)
Since Inception rr_AverageAnnualReturnSinceInception 1.22%
Principal LifeTime Hybrid 2060 Fund | Principal LifeTime Hybrid 2060 Fund, Institutional Class  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 319.03%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.51%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 319.54%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (318.98%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.56%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 57
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 22,394
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 $ 98,938
Principal LifeTime Hybrid 2060 Fund | Principal LifeTime Hybrid 2060 Fund, R-3  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 134.63% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.51%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 135.39%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (134.26%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.13%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 115
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 5,081
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 5,171
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 5,181
Principal LifeTime Hybrid 2060 Fund | Principal LifeTime Hybrid 2060 Fund, R-5  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 134.57% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.51%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 135.08%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (134.26%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.82%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 84
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 5,083
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 5,169
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 5,178
Principal LifeTime Hybrid 2060 Fund | Principal LifeTime Hybrid 2060 Fund, R-6  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 134.38% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.51%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 134.89%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (134.36%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.53%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2017
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 54
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 5,079
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 5,164
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 5,172
[1] Management Fees in the table have been restated to reflect current fees. Effective March 1, 2016, the Management Fees were reduced.
[2] Principal Management Corporation ("Principal"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund, (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.05% for Institutional, 0.62% for R-3, 0.31% for R-5 and 0.02% for R-6 shares. It is expected that the expense limits will continue through the period ending February 28, 2017; however, Principal Funds, Inc. and Principal, the parties to the agreement, may mutually agree to terminate the expense limits prior to the end of the period.
[3] Based on estimated amounts for the current fiscal year (Classes R-3, R-5, and R-6).