Shareholder Service Plan fees Other expenses Total Annual Fund Operating Expenses Oakmark Bond Fund R6 Class Advisor Class Institutional Class Investor Class Call Risk [Member] Liquidity Risk [Member] Government-Sponsored Entity Securities Risk [Member] Sovereign Debt Risk [Member] Lower-Rated Debt Securities Risk [Member] Loan Interests Risk [Member] Restricted Securities Risk [Member] Mortgage- and Asset-Backed Securities Risk [Member] Prepayment and Extension Risk [Member] Other Investment Company Risk [Member] Market Risk [Member] Non-U.S. Securities Risk [Member] Derivatives Risk [Member] Leverage Risk [Member] Variable and Floating Rate Instruments Risk [Member] When-Issued and Forward-Settling Securities Risk [Member] Common Stock Risk [Member] Sector or Industry Risk [Member] Value Style Risk [Member] Currency Risk [Member] High Portfolio Turnover Risk [Member] Credit Risk [Member] Interest Rate Risk [Member] Bloomberg U.S. Aggregate Bond Index (does not reflect the deduction of fees, expenses or taxes) Value Style Risk Member When Issued And Forward Settling Securities Risk Member Other Investment Company Risk Member CreditRiskMember S000068760 Member C000235267 Member index_ Bloomberg_ US_ Aggregate_ Bond_ Index_does_not_reflect_the_deduction_of_fees_expenses_or_taxes Member Prepayment And Extension Risk Member Variable And Floating Rate Instruments Risk Member C000219731 Member Sovereign Debt Risk Member Lower Rated Debt Securities Risk Member Call Risk Member C000225891 Member Liquidity Risk Member Mortgage And Asset Backed Securities Risk Member Sector Or Industry Risk Member Market Risk Member Leverage Risk Member Restricted Securities Risk Member Non USSecurities Risk Member Loan Interests Risk Member Currency Risk Member Derivatives Risk Member InterestRateRiskMember Government Sponsored Entity Securities Risk Member C000219732 Member High Portfolio Turnover Risk Member Common Stock Risk Member