Label	Element	Value
GoodHaven Fund \| Berkshire Hathaway, Inc. - Class B [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	17.30%
GoodHaven Fund \| TerraVest Industries, Inc. [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	7.80%
GoodHaven Fund \| Alphabet, Inc. - Class C [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	7.30%
GoodHaven Fund \| EXOR NV [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	6.00%
GoodHaven Fund \| United States Treasury Bills [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	6.00%
GoodHaven Fund \| Bank of America Corp. [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	5.60%
GoodHaven Fund \| Jefferies Financial Group, Inc. [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	4.70%
GoodHaven Fund \| Chubb Ltd. [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	4.60%
GoodHaven Fund \| Builders FirstSource, Inc. [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	4.30%
GoodHaven Fund \| The Progressive Corp. [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	4.00%
GoodHaven Fund \| Diversified Holding Companies [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	17.30%
GoodHaven Fund \| Property/Casualty Insurance [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	8.60%
GoodHaven Fund \| Oil & Gas Exploration & Production [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	8.40%
GoodHaven Fund \| Oil & Gas Equipment & Services [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	7.80%
GoodHaven Fund \| Investment Management [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	7.40%
GoodHaven Fund \| Interactive Media & Services [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	7.30%
GoodHaven Fund \| Banks-Diversified [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	6.50%
GoodHaven Fund \| Industrial Conglomerate [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	6.00%
GoodHaven Fund \| Capital Markets [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	4.70%
GoodHaven Fund \| Cash & Other [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	26.00%

GoodHaven Fund | Berkshire Hathaway, Inc. - Class B [Member]