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Employee Benefit Plans - Multi-Employer Plan (Details)
$ in Thousands
12 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
lb
Jun. 30, 2018
USD ($)
Multiemployer Plans [Line Items]      
Employer contributions $ 3,054 $ 3,325  
Multiemployer plan, estimated contribution in next fiscal year 4,500    
Western Conference of Teamsters Pension Plan      
Multiemployer Plans [Line Items]      
Employer contributions 1,685 $ 3,634 $ 1,605
Employer contributions (percentage)   5.00%  
Program for Enhanced Early Retirement      
Multiemployer Plans [Line Items]      
Employer contributions (percentage)   6.50%  
Employer contributions (hours) | lb   173  
All Other Plans      
Multiemployer Plans [Line Items]      
Employer contributions $ 34 $ 39 $ 35