Other Long-Term Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Other long-term assets [Abstract]
Right of use assets	$ 29,302	$ 30,999
Interest rate swap (See Note 15)	12,335	0
Prepaid unamortized debt issuance cost - revolver	2,201	537
SERP investments	1,439	1,214
Vendor contract assets	1,329	2,889
Other long-term assets	5,378	4,368
Total	$ 51,984	$ 40,007