Summary of Significant Accounting Policies, Revenue Recognition (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Contract Liability [Abstract]
Beginning contract liability	$ 17,280	$ 4,880
Revenue recognized from contract liabilities included in the beginning balance	(16,873)	(4,880)
Increases due to cash received, net of amounts recognized in revenue during the period	46,203	17,280
Ending contract liability	46,610	17,280
Contract Asset [Abstract]
Contract asset	2,300	$ 1,500
Increase to net income from new revenue recognition standard	$ 900
Increase to basic EPS from new revenue recognition standard (in dollars per share)	$ 0.14
Increase to diluted EPS from new revenue recognition standard (in dollars per share)	$ 0.14
Timing of Revenue [Abstract]
Percentage on Timing of Revenue Recognition	100.00%	100.00%
Transferred at Point in Time [Member]
Timing of Revenue [Abstract]
Percentage on Timing of Revenue Recognition	93.90%	95.50%
Transferred over Time [Member]
Timing of Revenue [Abstract]
Percentage on Timing of Revenue Recognition	6.10%	4.50%