Employee Benefit Plans - Components of Net Periodic Benefit Cost and Amounts Recognized in Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Components of net periodic benefit cost
Interest cost	$ 3,437	$ 4,236
Expected return on plan assets	(4,151)	(4,406)
Amortization of net loss	2,010	1,479
Net periodic benefit cost	1,296	1,309
Other changes recognized in OCI
Net (gain) loss (1)	(15,767)	14,779
Amortization of net loss	(2,010)	(1,479)
Total recognized in OCI	(17,777)	13,300
Total recognized in net periodic benefit cost and OCI	$ (16,481)	$ 14,609
Weighted average assumptions used to determine benefit obligations
Discount rate	2.55%	3.45%
Expected long-term return on plan assets	6.25%	6.75%
Farmer Brothers Plan
Components of net periodic benefit cost
Interest cost	$ 3,309	$ 4,084
Expected return on plan assets	(3,959)	(4,174)
Amortization of net loss	1,987	1,475
Net periodic benefit cost	1,337	1,385
Other changes recognized in OCI
Net (gain) loss (1)	(15,127)	14,225
Amortization of net loss	(1,987)	(1,475)
Total recognized in OCI	(17,114)	12,750
Total recognized in net periodic benefit cost and OCI	$ (15,777)	$ 14,135
Weighted average assumptions used to determine benefit obligations
Discount rate	2.55%	3.45%
Expected long-term return on plan assets	6.25%	6.75%
Hourly Employees’ Plan
Components of net periodic benefit cost
Interest cost	$ 128	$ 152
Expected return on plan assets	(192)	(232)
Amortization of net loss	23	4
Net periodic benefit cost	(41)	(76)
Other changes recognized in OCI
Net (gain) loss (1)	(640)	554
Amortization of net loss	(23)	(4)
Total recognized in OCI	(663)	550
Total recognized in net periodic benefit cost and OCI	$ (704)	$ 474
Weighted average assumptions used to determine benefit obligations
Discount rate	2.55%	3.45%
Expected long-term return on plan assets	6.25%	6.75%