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Leases (Details) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2020
Leases [Abstract]          
Operating Lease, Liability, Current $ 13,256,000   $ 13,256,000   $ 11,056,000
Finance Lease, Liability, Current 613,000   613,000   $ 418,000
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months 10,353,000   10,353,000    
Lessee, Operating Lease, Liability, Payments, Due Year Two 11,349,000   11,349,000    
Lessee, Operating Lease, Liability, Payments, Due Year Three 7,458,000   7,458,000    
Lessee, Operating Lease, Liability, Payments, Due Year Four 4,701,000   4,701,000    
Lessee, Operating Lease, Liability, Payments, Due Year Five 3,297,000   3,297,000    
Lessee, Operating Lease, Liability, Payments, Due after Year Five 7,410,000   7,410,000    
Lessee, Operating Lease, Liability, Payments, Due 44,568,000   44,568,000    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount 4,443,000   4,443,000    
Operating Lease, Liability 40,125,000   40,125,000    
Finance Lease, Liability, Payments, Due Next Twelve Months 475,000   475,000    
Finance Lease, Liability, Payments, Due Year Two 613,000   613,000    
Finance Lease, Liability, Payments, Due Year Three 606,000   606,000    
Finance Lease, Liability, Payments, Due Year Four 561,000   561,000    
Finance Lease, Liability, Payments, Due Year Five 277,000   277,000    
Finance Lease, Liability, Payments, Due after Year Five 5,000   5,000    
Finance Lease, Liability, Payment, Due 2,537,000   2,537,000    
Finance Lease, Liability, Undiscounted Excess Amount 231,000   231,000    
Finance Lease, Liability 2,306,000   2,306,000    
Lessee, Total Lease, Liability, Payments, Remainder of Fiscal Year [Line Items] 10,828,000   10,828,000    
Total Lease, Liability, Payments, Year Two 11,962,000   11,962,000    
Total Lease, Liability, Payments, Year Three 8,064,000   8,064,000    
Total Lease, Liability, Payments, Year Four 5,262,000   5,262,000    
Total Lease, Liability, Payments, Year Five 3,574,000   3,574,000    
Total Lease, Liability, Payments, Due After Year Five 7,415,000   7,415,000    
Total Lease, Liability, Payments Due 47,105,000   47,105,000    
Total Lease, Liability, Undiscounted Excess Amount 4,674,000   4,674,000    
Total Lease, Liability 42,431,000   42,431,000    
Lessee, Operating Lease, Lease Not yet Commenced, Description 4,175,000   4,175,000    
Operating Lease, Cost 3,804,000 $ 2,917,000 7,049,000 $ 5,940,000  
Finance Lease, Right-of-Use Asset, Amortization 133,000 60,000 242,000 60,000  
Finance Lease, Interest Expense 26,000 15,000 48,000 15,000  
Finance Lease, Cost 159,000 75,000 290,000 75,000  
Short-term Lease, Cost 237,000 279,000 550,000 475,000  
Variable Lease, Cost 343,000 251,000 634,000 428,000  
Lease, Cost 4,543,000 3,522,000 8,523,000 6,918,000  
Operating Lease, Payments 3,654,000 3,181,000 7,649,000 6,298,000  
Finance Lease, Interest Payment on Liability 0 15,000 48,000 15,000  
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 6,247,000 2,557,000 14,861,000 8,144,000  
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability $ 396,000 $ 497,000 $ 960,000 $ 928,000  
Operating Lease, Weighted Average Remaining Lease Term 4 years 10 months 24 days   4 years 10 months 24 days   4 years 3 months 18 days
Finance Lease, Weighted Average Remaining Lease Term 4 years 2 months 12 days   4 years 2 months 12 days   4 years 4 months 24 days
Operating Lease, Weighted Average Discount Rate, Percent 3.80%   3.80%   3.90%
Finance Lease, Weighted Average Discount Rate, Percent 4.70%   4.70%   5.10%