Stock-Based Compensation - Stock Based Compensation Expense and its Classification in the Consolidated Statement of Operations (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Jun. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Recorded as expenses:
Total stock-based compensation	$ 15,763	$ 1,744	$ 606
Cost of maintenance
Recorded as expenses:
Total stock-based compensation	344	0	0
Cost of services and other
Recorded as expenses:
Total stock-based compensation	282	0	0
Selling and marketing
Recorded as expenses:
Total stock-based compensation	2,850	0	0
Research and development
Recorded as expenses:
Total stock-based compensation	3,507	0	0
General and administrative
Recorded as expenses:
Total stock-based compensation	7,429	1,744	606
License [Member]
Recorded as expenses:
Total stock-based compensation	$ 1,351	$ 0	$ 0