Summary of Significant Accounting Policies, Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Sep. 30, 2021
Contract Asset [Abstract]
Contract asset	$ 4,100		$ 4,100		$ 2,300
Contract Liability [Abstract]
Beginning contract liability	56,986		46,610
Revenue recognized from contract liabilities included in the beginning balance	(30,334)		(37,251)
Increases due to cash received, net of amounts recognized in revenue during the period	36,862		54,155
Ending contract liability	$ 63,514		$ 63,514
Timing of Revenue [Abstract]
Percentage on Timing of Revenue Recognition	100.00%	100.00%	100.00%	100.00%
Goods and Services Transferred at a Point in Time [Member]
Timing of Revenue [Abstract]
Percentage on Timing of Revenue Recognition	95.20%	94.50%	94.30%	94.20%
Goods and Services Transferred Over Time [Member]
Timing of Revenue [Abstract]
Percentage on Timing of Revenue Recognition	4.80%	5.50%	5.70%	5.80%