Investment in Derivative Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized Gain (Loss)	$ (60)	$ (820)	$ 5
Unrealized Gain (Loss)	3,209	(1,900)	(565)
Total Gain (Loss)	3,149	(2,720)	(560)
Cost of revenues
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized Gain (Loss)	830	(432)	0
Unrealized Gain (Loss)	2,315	(503)	0
Total Gain (Loss)	3,145	(935)	0
Interest expense, net
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized Gain (Loss)	(890)	(388)	5
Unrealized Gain (Loss)	894	(1,397)	(565)
Total Gain (Loss)	$ 4	$ (1,785)	$ (560)