Average Annual Total Returns		12 Months Ended	60 Months Ended	120 Months Ended
	Mar. 30, 2026	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025
S&P 500® Index (reflects no deduction for fees, expenses or taxes)
Prospectus [Line Items]
Average Annual Return, Label [Optional Text]	S&P 500® Index (reflects no deduction for fees, expenses or taxes)
Average Annual Return, Percent		17.88%	14.42%	14.82%
GoodHaven Fund Class
Prospectus [Line Items]
Average Annual Return, Label [Optional Text]	Return Before Taxes
Average Annual Return, Percent		7.05%	15.47%	11.34%
GoodHaven Fund Class | After Taxes on Distributions
Prospectus [Line Items]
Average Annual Return, Label [Optional Text]	Return After Taxes on Distributions
Average Annual Return, Percent		6.32%	15.06%	11.06%
GoodHaven Fund Class | After Taxes on Distributions and Sales
Prospectus [Line Items]
Average Annual Return, Label [Optional Text]	Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Return, Percent		4.71%	12.45%	9.39%