T. Rowe Price Institutional Floating Rate Fund T. Rowe Price Institutional Floating Rate Fund - Institutional Class [Member] T. Rowe Price Institutional Floating Rate Fund-F Class [Member] Floating rate loans [Member] Credit quality [Member] Junk bonds [Member] Market conditions [Member] Covenant lite loans [Member] Impairment of collateral [Member] Senior Loans [Member] Liquidity [Member] Interest rates [Member] Prepayments [Member] Foreign investing [Member] Active management [Member] Cybersecurity breaches [Member] T. Rowe Price Institutional High Yield Fund Fixed income markets [Member] Bank loans [Member] Callable bonds [Member] Convertible securities and preferred stocks [Member] T. Rowe Price Institutional Long Duration Credit Fund Mortgage- and asset-backed securities [Member] Prepayments and extensions [Member] Derivatives [Member] T. Rowe Price Institutional High Yield Fund [Member] T. Rowe Price Institutional Long Duration Credit Fund [Member] Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes) Morningstar LSTA Performing Loan Index (reflects no deduction for fees, expenses, or taxes) Bloomberg U.S. High-Yield 2% Issuer Capped Bond Index (reflects no deduction for fees, expenses, or taxes) Lipper High Yield Funds Average Bloomberg U.S. Long Credit Bond Index (reflects no deduction for fees, expenses, or taxes) Lipper Corporate Debt Funds BBB-Rated Average T. Rowe Price Institutional High Yield Fund T. Rowe Price Institutional High Yield Fund [Member] T. Rowe Price Institutional Floating Rate Fund T. Rowe Price Institutional Floating Rate Fund - Institutional Class [Member] T. Rowe Price Institutional Floating Rate Fund-F Class [Member] T. Rowe Price Institutional Long Duration Credit Fund T. Rowe Price Institutional Long Duration Credit Fund [Member] Cybersecurity breaches. Active management. Liquidity. Derivatives. Prepayments and extensions. Foreign investing. Credit quality. Interest rates. Market conditions. Fixed income markets. Prepayments. Impairment of collateral. Covenant lite loans. Floating rate loans. Convertible securities and preferred stocks. Callable bonds. Bank loans. Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes) Morningstar LSTA Performing Loan Index (reflects no deduction for fees, expenses, or taxes) Bloomberg U.S. High-Yield 2% Issuer Capped Bond Index (reflects no deduction for fees, expenses, or taxes) Bloomberg U.S. Long Credit Bond Index (reflects no deduction for fees, expenses, or taxes) Lipper Corporate Debt Funds BBB-Rated Average Junk bonds. Mortgage- and asset-backed securities. Lipper High Yield Funds Average