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Muzinich Flexible U.S. High Yield Income Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Muzinich Flexible U.S. High Yield Income Fund
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock
Muzinich logo.jpg

Muzinich Flexible U.S. High Yield Income Fund
    
Class A Shares (Ticker: MZHRX)*
Institutional Shares (Ticker: MZHIX)
Supra Institutional Shares (Ticker: MZHSX)
* Shares are not available at this time.
(the “Fund”)
a series of Professionally Managed Portfolios (the “Trust”)

Supplement dated September 22, 2023, as amended March 12, 2024, to the
Statutory Prospectus dated April 30, 2023

At a prior meeting of the Board of Trustees (the “Board”) of the Trust, based on the recommendation of Muzinich & Co., Inc., the investment advisor to the Fund (the “Advisor”), the Board approved a change to the Fund’s name. Additionally, there will be certain other changes implemented with respect to the Fund, as described below:

3. Change in the Primary Benchmark Index for the Fund.

Effective October 1, 2023, (the “Effective Date”), the primary benchmark index for the Fund changed from the ICE BofA BB-B US Cash Pay High Yield Constrained Index (JUC4) to the ICE BofA 1-5 Year BB-B US Cash Pay High Yield Constrained Index (JVC4) as the Advisor believes that it is a better representation of the Fund’s investment strategy.
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged 3. Change in the Primary Benchmark Index for the Fund. Effective October 1, 2023, (the “Effective Date”), the primary benchmark index for the Fund changed from the ICE BofA BB-B US Cash Pay High Yield Constrained Index (JUC4) to the ICE BofA 1-5 Year BB-B US Cash Pay High Yield Constrained Index (JVC4) as the Advisor believes that it is a better representation of the Fund’s investment strategy.
Supplement Closing [Text Block] ck0000811030_SupplementClosingTextBlock
Please retain this Supplement with your Prospectus.
Muzinich Flexible U.S. High Yield Income Fund | Class A Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol MZHRX
Muzinich Flexible U.S. High Yield Income Fund | Institutional Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol MZHIX
Muzinich Flexible U.S. High Yield Income Fund | Supra Institutional Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol MZHSX