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Income Taxes - Reconciliation (Details)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Reconciliation of the U.S. federal statutory rate to the effective rate for continuing operations
U.S. statutory rate (as a percent)	21.00%	21.00%	21.00%
Stock based compensation (as a percent)	(14.10%)	(14.90%)	(2.00%)
Non deductible compensation expense (as a percent)	5.50%	(6.00%)	(0.60%)
Permanent items (as a percent)	0.10%	(1.10%)	(4.20%)
State taxes (as a percent)	3.00%	(13.20%)	(0.40%)
Net foreign rate differential (as a percent)	0.50%	(0.80%)	(0.60%)
Unrecognized tax benefits (as a percent)	0.10%	5.10%	(1.50%)
Change in valuation allowance (as a percent)	(98.90%)	9.90%	(22.50%)
Write-down of deferred tax assets on share-based stock compensation (as a percent)	0.70%	(12.30%)	(7.90%)
Write-down of deferred tax assets on net operating loss (as a percent)	(0.028)	(0.159)	0.106
Other (as a percent)	0.20%	1.30%	1.50%
Effective rate	(84.70%)	(26.90%)	(6.60%)

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