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Employee Benefit Plans - Narrative (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2019
USD ($)
plan
hour
shares
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jan. 09, 2019
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Jan. 08, 2019
USD ($)
Jan. 05, 2015
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Nov. 18, 2014
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Jun. 30, 2012
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                    
Multiemployer Plans, Estimated Employer Contributions in Next Fiscal Year     $ 5,800,000              
Plan assets by category     100.00% 100.00%            
Defined contribution plan, hours threshold for eligibility | hour     1,000              
Defined contribution plan, employer matching contribution percent     50.00%              
Defined contribution plan, employer matching contribution, percent of eligible income     6.00%              
Defined contribution plan, employer matching contribution   $ 1,600,000 $ 2,200,000 $ 2,000,000            
Defined benefit plan, discount rate     4.05% 4.05%            
Amortization of net gain (loss)     $ (600,000)              
Amortization of prior service cost (credit)     1,600,000              
Pension Withdrawal Expense     10,948,000 $ 0 $ 0          
Multiemployer Plans, Withdrawal Obligation, Assessment     500,000     $ 500,000 $ 500,000      
Other Commitment, Due after Fifth Year     $ 200,000              
Multiemployer Plans, Defined Benefit Pension Plans [Member]                    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                    
Multiemployer plans, number of plans | plan     2              
Multiemployer Plans, Defined Contribution Pension Plan [Member]                    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                    
Multiemployer plans, number of plans | plan     1              
Other Postretirement Benefits Plan                    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                    
Multiemployer plans, number of plans | plan     9              
Expected employer contributions in the next fiscal year     $ 1,087,000              
Postretirement Benefit Costs [Member]                    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                    
Defined benefit plan, discount rate     3.60%              
Defined benefit plan, ultimate health care cost trend rate     8.10%              
Defined benefit plan, health care cost rate trend rate     4.50%              
Real estate                    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                    
Plan assets by category     6.00% 6.00%            
WCTPP                    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                    
Withdrawal obligation     $ 1,500,000              
Multiemployer Plans, Withdrawal Obligation, Assessment     $ 3,400,000              
Labor Management Pension Fund                    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                    
Withdrawal obligation               $ 4,900,000 $ 4,400,000 $ 4,300,000
Multiemployer plan, quarterly installments for withdrawal liability   $ 100,000                
Local 807 Pension Plan [Member]                    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                    
Defined Benefit Plan, Benefit Obligation, Payment for Settlement $ 3,000,000                  
Multiemployer plan, quarterly installments for withdrawal liability $ 91,000                  
Farmer Brothers Plan                    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                    
Plan assets by category     0.00% 100.00%            
Defined benefit plan, discount rate     4.10% 4.05%            
Farmer Brothers Plan | Real estate                    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                    
Plan assets by category     0.00% 6.00%            
Brewmatic Plan                    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                    
Amount expected to be recognized as a component of net periodic benefit cost in the next fiscal year     $ 1,385,000              
Plan assets by category     100.00% 100.00%            
Expected employer contributions in the next fiscal year     $ 4,000,000              
Defined benefit plan, discount rate     3.45% 4.05%            
Brewmatic Plan | Real estate                    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                    
Plan assets by category     6.00% 6.00%            
Hourly Employees’ Plan                    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                    
Amount expected to be recognized as a component of net periodic benefit cost in the next fiscal year     $ (75,000)              
Plan assets by category     100.00% 100.00%            
Defined benefit plan, discount rate     3.45% 4.05%            
Hourly Employees’ Plan | Real estate                    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                    
Plan assets by category     6.00% 6.00%            
Employee-related | WCTPP                    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                    
Defined Benefit Plan, Benefit Obligation, Payment for Settlement     $ 153,822              
Multiemployer plan, quarterly installments for withdrawal liability     $ 190,507              
Restated and Amended 401K Plan [Member]                    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                    
Defined contribution plan, employer matching contribution percent     100.00%              
Defined contribution plan, shares contributed | shares     90,105              
Defined contribution plan, contribution amount     $ 1,600,000              
Defined contribution plan, shares issued | shares     52,534              
Defined contribution plan, employer matching contribution, percent of eligible income     4.00%