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Employee Benefit Plans - Narrative (Details)
3 Months Ended 12 Months Ended
Mar. 23, 2020
USD ($)
Sep. 30, 2020
USD ($)
plan
shares
Jun. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
shares
Jun. 30, 2020
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Defined Contribution Plan, Employer Matching Contribution, Amount   $ 700,000      
Defined Contribution Plan, Number of Shares Contributed | shares   108,426      
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Reclassification Adjustment, before Tax $ (13,400,000)        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Increase (Decrease) for Plan Amendment $ (14,600,000)        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment         $ (5,800,000)
Amortization expense   $ 600,000 $ 600,000    
Other Postretirement Benefit Plan          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Multiemployer plans, number of plans | plan   9      
Restated and Amended 401K Plan          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Defined contribution plan, employer matching contribution, percent of eligible income   4.00%      
Defined Contribution Plan, Number of Shares Contributed | shares       55,624  
Defined Contribution Plan, Employer Discretionary Contribution Amount   $ 500,000   $ 900,000