Leases - Narrative (Details)	6 Months Ended
	Mar. 31, 2021 sublease_option sublease
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of facilities subleased | sublease	1
Sublease term	5 years
Sublease number of additional extension options | sublease_option	2
Sublease extension option period	1 year
Facilities and Equipment | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Remaining lease term	1 year 9 months 18 days
Facilities and Equipment | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Remaining lease term	10 years