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Finance and Operating Leases (Details) - USD ($)
Mar. 31, 2021
Sep. 30, 2020
Jul. 31, 2020
Jun. 30, 2020
Apr. 30, 2020
Finance and Operating Leases          
Finance lease liability $ 69,153,000     $ 17,938,000  
Finance lease right-of-use assets 55,500,000     $ 19,800,000  
Purchase option $ 1        
Minimum          
Finance and Operating Leases          
Interest rate on finance lease (as a percent) 1.52%        
Finance lease term 1 year        
Maximum          
Finance and Operating Leases          
Interest rate on finance lease (as a percent) 3.87%     3.87%  
Finance lease term 3 years        
PNC          
Finance and Operating Leases          
Finance lease term 36 months        
Purchase option $ 1        
BALC          
Finance and Operating Leases          
Available line of credit   $ 45,000,000.0 $ 41,000,000.0   $ 25,000,000.0
Purchase option   $ 1      
BALC | Minimum          
Finance and Operating Leases          
Finance lease term   12 months      
Fixed interest rate (as a percent)   1.52%      
BALC | Maximum          
Finance and Operating Leases          
Finance lease term   36 months      
Fixed interest rate (as a percent)   2.58%