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Employee Benefit Plans - Schedule of Multi-Employer Pension Plans (Details) - USD ($)
 3 Months Ended 9 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Jun. 30, 2019
Local 807 Pension Plan          
Multiemployer Plans [Line Items]          
Other Commitment $ 182,000   $ 182,000    
Multiemployer Plans, Pension          
Multiemployer Plans [Line Items]          
Defined Benefit Plan, Plan Assets, Contributions by Employer 240,000 $ 585,000 1,120,000 $ 1,364,000  
Multiemployer Plans, Pension | WCT Pension Trust          
Multiemployer Plans [Line Items]          
Other Commitment 0   0   $ 1,487,000
Multiemployer Plans, Pension | Local 807 Pension Plan          
Multiemployer Plans [Line Items]          
Multiemployer plan, quarterly installments for withdrawal liability     91,000    
Defined Benefit Plan, Benefit Obligation, Payment for Settlement     3,000,000.0    
Other Commitment, Due after Fifth Year 200,000   200,000    
Multiemployer Plans, Pension | WCTPP          
Multiemployer Plans [Line Items]          
Multiemployer Plans, Withdrawal Obligation, Assessment 3,400,000   3,400,000    
Multiemployer Plans, Pension | Employee-related | WCTPP          
Multiemployer Plans [Line Items]          
Multiemployer plan, quarterly installments for withdrawal liability     190,507    
Defined Benefit Plan, Benefit Obligation, Payment for Settlement     153,822    
Other Postretirement Benefit Plan          
Multiemployer Plans [Line Items]          
Defined Benefit Plan, Service Cost 147,000 133,000 441,000 399,000  
Defined Benefit Plan, Interest Cost 214,000 222,000 641,000 666,000  
Defined Benefit Plan, Amortization of Gain (Loss) (125,000) (209,000) (374,000) (627,000)  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment (5,750,000) 0 (5,750,000) 0  
Amortization of prior service credit (395,000) (439,000) (1,186,000) (1,317,000)  
Net periodic benefit cost $ (5,909,000) $ (293,000) $ (6,228,000) $ (879,000)  
Postretirement Health Coverage          
Multiemployer Plans [Line Items]          
Discount rate     3.44% 4.25%  
Postretirement Life Insurance          
Multiemployer Plans [Line Items]          
Discount rate     3.64% 4.25%