Employee Benefit Plans - Components of Net Periodic Benefit Cost and Amounts Recognized in Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2019	Jun. 30, 2018
Components of net periodic benefit cost
Interest cost		$ 5,222	$ 5,729
Expected return on plan assets		(5,246)	(5,824)
Amortization of net loss		1,506	1,674
Pension settlement charge		10,942	0
Net periodic benefit cost		12,424	1,579
Other changes recognized in OCI
Net loss		9,193	(7,001)
Prior service cost (credit)		0	0
Amortization of net loss		(1,506)	(1,674)
Pension settlement charge		(10,942)	0
Allocation of net Loss - Plan merger		0	0
Net loss due to annuity purchase		814	0
Total recognized in OCI		(2,441)	(8,675)
Total recognized in net periodic benefit cost and OCI		9,983	(7,096)
Other Postretirement Benefits Plan
Components of net periodic benefit cost
Interest cost	$ 829	887	835
Amortization of net loss	(630)	(834)	(841)
Net periodic benefit cost	$ (798)	(1,174)	(1,154)
Other changes recognized in OCI
Net loss		2,010	(70)
Amortization of net loss		835	840
Amortization of prior service cost		(1,757)	(1,757)
Total recognized in OCI		4,602	2,527
Total recognized in net periodic benefit cost and OCI		3,428	1,373
Farmer Brothers Plan
Components of net periodic benefit cost
Interest cost		2,722	5,417
Expected return on plan assets		(2,767)	(5,490)
Amortization of net loss		710	1,588
Pension settlement charge		1,356	0
Net periodic benefit cost		2,021	1,515
Other changes recognized in OCI
Net loss		7,433	(6,340)
Prior service cost (credit)		0	0
Amortization of net loss		(710)	(1,588)
Pension settlement charge		(1,356)	0
Allocation of net Loss - Plan merger		(56,446)	0
Net loss due to annuity purchase		0	0
Total recognized in OCI		(51,079)	(7,928)
Total recognized in net periodic benefit cost and OCI		$ (49,058)	$ (6,413)
Weighted average assumptions used to determine benefit obligations
Discount rate		4.05%	3.80%
Expected long-term return on plan assets		0.00%	6.75%
Brewmatic Plan
Components of net periodic benefit cost
Interest cost		$ 2,339	$ 149
Expected return on plan assets		(2,257)	(161)
Amortization of net loss		796	80
Pension settlement charge		9,586	0
Net periodic benefit cost		10,464	68
Other changes recognized in OCI
Net loss		1,413	(267)
Prior service cost (credit)		0	0
Amortization of net loss		(796)	(80)
Pension settlement charge		(9,586)	0
Allocation of net Loss - Plan merger		56,446	0
Net loss due to annuity purchase		814	0
Total recognized in OCI		48,291	(347)
Total recognized in net periodic benefit cost and OCI		$ 58,755	$ (279)
Weighted average assumptions used to determine benefit obligations
Discount rate		4.10%	3.80%
Expected long-term return on plan assets		6.75%	6.75%
Hourly Employees’ Plan
Components of net periodic benefit cost
Interest cost		$ 161	$ 163
Expected return on plan assets		(222)	(173)
Amortization of net loss		0	6
Pension settlement charge		0	0
Net periodic benefit cost		(61)	(4)
Other changes recognized in OCI
Net loss		347	(394)
Prior service cost (credit)		0	0
Amortization of net loss		0	(6)
Pension settlement charge		0	0
Allocation of net Loss - Plan merger		0	0
Net loss due to annuity purchase		0	0
Total recognized in OCI		347	(400)
Total recognized in net periodic benefit cost and OCI		$ 286	$ (404)
Weighted average assumptions used to determine benefit obligations
Discount rate		4.05%	3.80%
Expected long-term return on plan assets		6.75%	6.75%