Employee Benefit Plans - Change in Projected Benefit Obligation, Plan Assets and Net Funded Status (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Change in projected benefit obligation
Benefit obligation at the beginning of the year		$ 144,939,000	$ 154,699,000
Interest cost		5,222,000	5,729,000
Actuarial (gain) loss		7,260,000	(6,553,000)
Benefits paid		(6,746,000)	(8,936,000)
Pension settlement		(24,448,000)	0
Other - Plan merger		0	0
Projected benefit obligation at the end of the year	$ 154,699,000	126,227,000	144,939,000	$ 154,699,000
Change in plan assets
Fair value of plan assets at the beginning of the year		104,559,000	103,418,000
Actual return on plan assets		3,313,000	6,273,000
Employer contributions		3,325,000	3,804,000
Benefits paid		(6,746,000)	(8,936,000)
Pension settlement		(25,262,000)	0
Other - Plan merger		0	0
Fair value of plan assets at the end of the year	103,418,000	79,189,000	104,559,000	103,418,000
Funded status at end of year (underfunded) overfunded		(47,038,000)	(40,380,000)
Amounts recognized in consolidated balance sheets
Short-term pension liabilities(1)		0	3,761,000
Noncurrent liabilities		(47,038,000)	(40,380,000)
Amounts Recognized in Balance Sheet		(47,038,000)	(40,380,000)
Amounts recognized in balance sheet
Net loss		50,645,000	53,085,000
Total accumulated OCI (not adjusted for applicable tax)		$ 50,645,000	$ 53,085,000
Weighted average assumptions used to determine benefit obligations
Discount rate		4.05%	4.05%
Other Postretirement Benefits Plan
Change in projected benefit obligation
Benefit obligation at the beginning of the year		$ 21,283,000	$ 20,680,000
Interest cost	829,000	887,000	835,000
Participant contributions		605,000	699,000
Actuarial (gain) loss		2,010,000	(70,000)
Benefits paid		(1,223,000)	(1,470,000)
Projected benefit obligation at the end of the year	20,680,000	24,092,000	21,283,000	20,680,000
Change in plan assets
Fair value of plan assets at the beginning of the year		0	0
Employer contributions			618,000	771,000
Participant contributions			605,000	699,000
Benefits paid			(1,223,000)	(1,470,000)
Fair value of plan assets at the end of the year	0	0	0	0
Funded status at end of year (underfunded) overfunded		(24,092,000)	(21,283,000)
Amounts recognized in consolidated balance sheets
Short-term pension liabilities(1)		1,068,000	810,000
Noncurrent liabilities		(23,024,000)	(20,473,000)
Amounts Recognized in Balance Sheet		(24,092,000)	(21,283,000)
Farmer Brothers Plan
Change in projected benefit obligation
Benefit obligation at the beginning of the year		137,175,000	146,291,000
Interest cost		2,722,000	5,417,000
Actuarial (gain) loss		(1,571,000)	(5,956,000)
Benefits paid		(3,574,000)	(8,577,000)
Pension settlement		(3,162,000)	0
Other - Plan merger		(131,590,000)	0
Projected benefit obligation at the end of the year	146,291,000	0	137,175,000	146,291,000
Change in plan assets
Fair value of plan assets at the beginning of the year		97,211,000	97,304,000
Actual return on plan assets		(6,236,000)	5,874,000
Employer contributions		1,525,000	2,610,000
Benefits paid		(3,574,000)	(8,577,000)
Pension settlement		(3,162,000)	0
Other - Plan merger		(85,764,000)	0
Fair value of plan assets at the end of the year	97,304,000	0	97,211,000	97,304,000
Funded status at end of year (underfunded) overfunded		0	(39,964,000)
Amounts recognized in consolidated balance sheets
Noncurrent liabilities		0	(39,964,000)
Amounts Recognized in Balance Sheet		0	(39,964,000)
Amounts recognized in balance sheet
Net loss		0	51,079,000
Total accumulated OCI (not adjusted for applicable tax)		$ 0	$ 51,079,000
Weighted average assumptions used to determine benefit obligations
Discount rate		4.10%	4.05%
Brewmatic Plan
Change in projected benefit obligation
Benefit obligation at the beginning of the year		$ 3,724,000	$ 4,079,000
Interest cost		2,339,000	149,000
Actuarial (gain) loss		8,482,000	(227,000)
Benefits paid		(3,097,000)	(277,000)
Pension settlement		(21,286,000)	0
Other - Plan merger		131,590,000	0
Projected benefit obligation at the end of the year	4,079,000	121,752,000	3,724,000	4,079,000
Change in plan assets
Fair value of plan assets at the beginning of the year		3,719,000	3,115,000
Actual return on plan assets		9,325,000	201,000
Employer contributions		1,800,000	680,000
Benefits paid		(3,097,000)	(277,000)
Pension settlement		(22,100,000)	0
Other - Plan merger		85,764,000	0
Fair value of plan assets at the end of the year	3,115,000	75,411,000	3,719,000	3,115,000
Funded status at end of year (underfunded) overfunded		(46,341,000)	(5,000)
Amounts recognized in consolidated balance sheets
Noncurrent liabilities		(46,341,000)	(5,000)
Amounts Recognized in Balance Sheet		(46,341,000)	(5,000)
Amounts recognized in balance sheet
Net loss		50,080,000	1,788,000
Total accumulated OCI (not adjusted for applicable tax)		$ 50,080,000	$ 1,788,000
Weighted average assumptions used to determine benefit obligations
Discount rate		3.45%	4.05%
Hourly Employees’ Plan
Change in projected benefit obligation
Benefit obligation at the beginning of the year		$ 4,040,000	$ 4,329,000
Interest cost		161,000	163,000
Actuarial (gain) loss		349,000	(370,000)
Benefits paid		(75,000)	(82,000)
Pension settlement		0	0
Other - Plan merger		0	0
Projected benefit obligation at the end of the year	4,329,000	4,475,000	4,040,000	4,329,000
Change in plan assets
Fair value of plan assets at the beginning of the year		3,629,000	2,999,000
Actual return on plan assets		224,000	198,000
Employer contributions		0	514,000
Benefits paid		(75,000)	(82,000)
Pension settlement		0	0
Other - Plan merger		0	0
Fair value of plan assets at the end of the year	$ 2,999,000	3,778,000	3,629,000	$ 2,999,000
Funded status at end of year (underfunded) overfunded		(697,000)	(411,000)
Amounts recognized in consolidated balance sheets
Noncurrent liabilities		(697,000)	(411,000)
Amounts Recognized in Balance Sheet		(697,000)	(411,000)
Amounts recognized in balance sheet
Net loss		565,000	218,000
Total accumulated OCI (not adjusted for applicable tax)		$ 565,000	$ 218,000
Weighted average assumptions used to determine benefit obligations
Discount rate		3.45%	4.05%