3.24.2.u1 html 228 36 1 false 58 0 false 6 false false R1.htm 030000 - Disclosure - Form N-CSR Cover Sheet http://xbrl.sec.gov/oef/role/NcsrCover Form N-CSR Cover Cover 1 false false R2.htm 030001 - Disclosure - Shareholder Report Sheet http://xbrl.sec.gov/oef/role/ShareholderReport Shareholder Report Notes 2 false false R3.htm 040010 - Disclosure - Shareholder Report, Line Graph (Details) Sheet http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails Shareholder Report, Line Graph (Details) Details 3 false false R4.htm 040015 - Disclosure - Shareholder Report, Average Annual Return (Details) Sheet http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails Shareholder Report, Average Annual Return (Details) Details 4 false false R5.htm 040020 - Disclosure - Shareholder Report, Holdings (Details) Sheet http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails Shareholder Report, Holdings (Details) Details 5 false false All Reports Book All Reports lf-20240630.xsd longleaf_ncsrs.htm back-cover_logo.jpg i085b5390caa5baf49880170e.jpg i1a131ddd1472b67297268990.jpg i1aa5d1706365b94735b44b31.jpg i2da7eca1c9dd32ce3b909758.jpg i3d4191ac7aef3d7145ab2836.jpg i7335b79f0533e348e9ac082e.jpg i7442ca8ed11b2efdb6b4fa21.jpg i76ba2747bb3d0ddf44fa2f38.jpg i93576b5b39497ab0884bc643.jpg i973d314d210417e4fd8ef109.jpg i9beeec351c55ebcdbd9009e3.jpg i9e51e86c01ab930ead9b3226.jpg ia96cec3051c54d4f9d8e4ba1.jpg ibc48fcfac6bad563de28f721.jpg icc4e53cde01b7a4981ffa6e4.jpg idb3ed255c6b8bdc31a271298.jpg if500b03cb2c258a97a8956c8.jpg ifb2e546dc6fed4d336a316c9.jpg logo_001.jpg http://fasb.org/us-gaap/2024 http://xbrl.sec.gov/dei/2024 http://xbrl.sec.gov/oef/2024 false false