SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Accounts Receivable Allowance for Current and Expected Credit Losses:
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ (3,167)	$ (2,608)	$ (1,762)
Additional (Charges)/Benefit to Income	(339)	(1,990)	(970)
Write offs and Other	996	1,431	124
Balance at End of Year	(2,510)	(3,167)	(2,608)
Deferred Tax Valuation Allowance:
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	(10,203)	(7,764)	(7,427)
Additional (Charges)/Benefit to Income	(2,190)	(2,047)	(346)
Write offs and Other	870	(392)	9
Balance at End of Year	$ (11,523)	$ (10,203)	$ (7,764)