Thornburg American Opportunities Fund Credit Risk [Member] Cybersecurity and Operational Risk [Member] Depositary Receipts Risk [Member] Equity Risk [Member] ETF Structure Risks [Member] Foreign Investment Risk [Member] Liquidity Risk [Member] Management Risk [Member] Market and Economic Risk [Member] Risks Affecting Specific Countries or Regions [Member] Risks Affecting Specific Issuers [Member] Thornburg Focus Growth Fund Growth Company Risk [Member] Thornburg American Opportunities Fund - ETF Class Thornburg Focus Growth Fund - ETF Class Thornburg American Opportunities Fund - Class I Thornburg Focus Growth Fund - Class I S&P 500 Index - Total Return (reflects no deduction for fees, expenses, or taxes) Russell 1000 Value Index - Total Return (reflects no deduction for fees, expenses, or taxes) Russell 3000 Index-Total Return (reflects no deduction for fees, expenses, or taxes) Russell 2500 Index-Total Return (reflects no deduction for fees, expenses, or taxes) Russell 1000 Index-Total Return (reflects no deduction for fees, expenses, or taxes) Russell 1000 Growth Index-Total Return (reflects no deduction for fees, expenses, or taxes) Russell 2500 Growth Index-Total Return (reflects no deduction for fees, expenses, or taxes) Thornburg American Opportunities Fund. Thornburg American Opportunities Fund - ETF Class. Thornburg Focus Growth Fund. Thornburg Focus Growth Fund - ETF Class. Risks Affecting Specific Issuers. Market and Economic Risk. Management Risk. Liquidity Risk. Growth Company Risk. Foreign Investment Risk. ETF Structure Risks. Equity Risk. Depositary Receipts Risk. Cybersecurity and Operational Risk. Risks Affecting Specific Countries or Regions. S&P 500 Index - Total Return (reflects no deduction for fees, expenses, or taxes). Russell 1000 Value Index - Total Return (reflects no deduction for fees, expenses, or taxes). Russell 3000 Index-Total Return (reflects no deduction for fees, expenses, or taxes). Russell 2500 Index-Total Return (reflects no deduction for fees, expenses, or taxes). Russell 1000 Index-Total Return (reflects no deduction for fees, expenses, or taxes). Russell 1000 Growth Index-Total Return (reflects no deduction for fees, expenses, or taxes). Russell 2500 Growth Index-Total Return (reflects no deduction for fees, expenses, or taxes). Thornburg American Opportunities Fund - Class I Thornburg Focus Growth Fund - Class I