Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Oct. 01, 2019
Leases [Abstract]
Current operating lease liabilities	$ 11,056
Current finance lease liabilities	418
Lessee, Operating Lease, Liability, Payments, Due Year One	11,269
Lessee, Operating Lease, Liability, Payments, Due Year Two	8,743
Lessee, Operating Lease, Liability, Payments, Due Year Three	5,822
Lessee, Operating Lease, Liability, Payments, Due Year Four	3,488
Lessee, Operating Lease, Liability, Payments, Due Year Five	2,110
Lessee, Operating Lease, Liability, Payments, Due after Year Five	3,175
Lessee, Operating Lease, Liability, Payments, Due	34,607
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	3,021
Operating Lease, Liability	31,586			$ 32,237
Finance Lease, Liability, Payments, Due Year One	430
Finance Lease, Liability, Payments, Due Year Two	403
Finance Lease, Liability, Payments, Due Year Three	401
Finance Lease, Liability, Payments, Due Year Four	368
Finance Lease, Liability, Payments, Due Year Five	167
Finance Lease, Liability, Payments, Due after Year Five	0
Finance Lease, Liability, Payment, Due	1,769
Finance Lease, Liability, Undiscounted Excess Amount	182
Finance Lease, Liability	1,587
Lessee, Total Lease, Liability, Payments, Due Year One	11,699
Total Lease, Liability, Payments, Year Two	9,146
Total Lease, Liability, Payments, Year Three	6,223
Total Lease, Liability, Payments, Year Four	3,856
Total Lease, Liability, Payments, Year Five	2,277
Total Lease, Liability, Payments, Due After Year Five	3,175
Total Lease, Liability, Payments Due	36,376
Total Lease, Liability, Undiscounted Excess Amount	3,203
Total Lease, Liability	33,173
Minimum payments for leases not yet commenced	3,946
Operating Lease, Cost	12,910
Finance Lease, Right-of-Use Asset, Amortization	203
Finance Lease, Interest Expense	47
Finance Lease, Cost	250
Short-term Lease, Cost	1,163
Variable Lease, Cost	827
Lease, Cost	15,150
Operating Lease, Payments	12,934
Finance Lease, Interest Payment on Liability	47
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	10,640
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 1,803
Operating Lease, Weighted Average Remaining Lease Term	4 years 3 months 18 days
Finance Lease, Weighted Average Remaining Lease Term	4 years 4 months 24 days
Operating Lease, Weighted Average Discount Rate, Percent	3.90%
Finance Lease, Weighted Average Discount Rate, Percent	5.10%
Operating Leases, Rent Expense	$ 14,073	$ 10,553	$ 7,680
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent