Share-Based Compensation - Narrative (Details) - USD ($)		12 Months Ended
		Jun. 30, 2017		Jun. 30, 2016		Jun. 30, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Stock Repurchased and Retired During Period, Shares	[1]	11,147
Number of options granted (shares)		22,862
Proceeds from stock option exercises		$ 688,000		$ 1,694,000		$ 1,548,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options		$ 80,000		$ 400,000
Shares withheld to cover taxes (in shares)		17,473		5,177		4,297
Chief Executive Officer
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation, maximum number of shares per employee per calendar year		75,000
Share-based Compensation Arrangement by Share-based Payment Award, Invalid Awards in Excess Maximum Number of Shares Per Employee		22,862
Restricted Stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Unrecognized compensation cost related to restricted stock		$ 300,000		$ 500,000
Restricted Stock | General and Administrative Expense
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Compensation expense recognized		$ 200,000		200,000		$ 300,000
2017 Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Shares authorized (shares)		900,000
Number of options granted (shares)		0
Share-based compensation, maximum number of shares per employee per calendar year		250,000
Stock Options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Estimated forfeiture rate		4.80%
Stock Options | General and Administrative Expense
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Compensation expense recognized		$ 100,000		$ 200,000		$ 400,000
NQOs
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share price (in US$ per share)		$ 30.25		$ 32.06		$ 23.50
Fair value of options vested		$ 200,000		$ 300,000		$ 500,000
Proceeds from stock option exercises		$ 500,000		$ 1,400,000
NQOs | Farmer Bros. Co. Amended and Restated 2007 Long-term Incentive Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Number of options granted (shares)				21,595		25,703
Employee Service Share-based Compensation, Nonvested Awards, Weighted Average Remaining Amortization Period		1 year 3 months 7 days
PNQs
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		80.00%
Fair value of options vested		$ 1,300,000		$ 300,000		$ 400,000
Proceeds from stock option exercises		$ 200,000		$ 300,000
Shares withheld to cover taxes (in shares)	[2]	6,326
PNQs | Farmer Bros. Co. Amended and Restated 2007 Long-term Incentive Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Number of options granted (shares)		149,223		143,466		121,024
Weighted average purchase price (in US$ per share)		$ 32.85		$ 29.48		$ 23.44
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options		$ 1,800,000		$ 1,900,000
Employee Service Share-based Compensation, Nonvested Awards, Weighted Average Remaining Amortization Period		1 year 3 months 29 days
Compensation expense recognized		$ 1,100,000		$ 500,000		$ 500,000
Restricted Stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Shares withheld to cover taxes (in shares)		5,177	[3]	4,297	[4]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period		7,458		24,841
Restricted Stock | Farmer Bros. Co. Amended and Restated 2007 Long-term Incentive Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Employee Service Share-based Compensation, Nonvested Awards, Weighted Average Remaining Amortization Period		1 year
Restricted Stock | Omnibus Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Restricted stock granted (in shares)		5,106		10,170		13,256
Restricted stock granted, weighted average grant date fair value (in US$ per share)		$ 35.25		$ 29.99		$ 23.64
Vested | NQOs
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Number of options granted (shares)		0		21,595		25,703
Weighted average purchase price (in US$ per share)		$ 0.00		$ 29.48		$ 23.91
Vested | Restricted Stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period						53,402

[1] Includes 11,147 shares that were withheld to cover option cost and meet the employees' minimum statutory tax withholding and retired.

[2] Includes 6,326 shares that were withheld to cover option cost and meet the employees' minimum statutory tax withholding and retired.

[3] Includes 5,177 shares that were withheld to meet the employees' minimum statutory tax withholding and retired.

[4] Includes 4,297 shares that were withheld to meet the employees' minimum statutory tax withholding and retired.