Significant Accounting Policies - Narrative (Details)	12 Months Ended
	Sep. 30, 2021
Property, Plant and Equipment [Line Items]
Number of reporting unit	1
Stock-based compensation awards vesting period	3 years
Minimum [Member]
Property, Plant and Equipment [Line Items]
Intangible assets, estimated useful lives	3 years
Property and equipment, estimated useful lives	3 years
Capitalized Contract Cost, Amortization Period	5 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Intangible assets, estimated useful lives	15 years
Property and equipment, estimated useful lives	35 years
Capitalized Contract Cost, Amortization Period	10 years