Restructuring and Other Charges, net - Narrative (Details) $ in Thousands	3 Months Ended
	Dec. 31, 2021 USD ($) employee	Dec. 31, 2020 USD ($) employee	Sep. 30, 2021 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net	$ 3,390	$ 7,860
Number of positions eliminated | employee	81	57
Restructuring reserve	$ 16,198		$ 17,390
Personnel
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net	3,195	$ 4,789
Restructuring reserve	847		444
Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net	195	3,071
Restructuring reserve	15,351		$ 16,946
Other Corporate Initiatives | Other Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net	5,000
Other Charges
Restructuring Cost and Reserve [Line Items]
Insurance recoveries	100
Other charges	$ 5,116	706
Other Charges | Other Charges
Restructuring Cost and Reserve [Line Items]
Other charges		$ 700