Summary of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Sep. 30, 2023 USD ($) Customer Segment Unit	Sep. 30, 2022 USD ($) Customer	Sep. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 02, 2020
Summary Of Significant Accounting Policies [Line Items]
Goodwill impairment charge	$ 0	$ 213,700,000	$ 0
Number of operating segment | Segment	1
Number of reporting unit | Unit	1
Impairment of long-lived asset group, disposition	$ 0	0	0
Undistributed earnings in our foreign subsidiaries are expected	0	0
Foreign currency transaction gain (loss)	$ 2,300,000	100,000	$ (1,700,000)
Operating lease, existence of option to extend	true
Operating lease, option to extend	Some of our leases include options to extend or terminate the lease prior to the end of the agreed upon lease term. For purposes of calculating lease liabilities, lease terms include options to extend or terminate the lease when it is reasonably certain that we will exercise such options.
Operating lease, existence of option to terminate	true
Operating lease, option to terminate	Some of our leases include options to extend or terminate the lease prior to the end of the agreed upon lease term. For purposes of calculating lease liabilities, lease terms include options to extend or terminate the lease when it is reasonably certain that we will exercise such options.
Deferred tax assets valuation allowance	$ 162,966,000	$ 126,860,000
ASU 2020-06, Adoption Date	Oct. 01, 2022
Foreign Jurisdiction
Summary Of Significant Accounting Policies [Line Items]
Deferred tax assets valuation allowance				$ 107,600,000
ASU 2020-06
Summary Of Significant Accounting Policies [Line Items]
Accounting standard adopted ASU 2020-06	true
3.00% Convertible Senior Notes Due 2025
Summary Of Significant Accounting Policies [Line Items]
Debt instrument, interest rate	3.00%	3.00%			3.00%
3.00% Convertible Senior Notes Due 2025 | ASU 2020-06
Summary Of Significant Accounting Policies [Line Items]
Debt instrument, interest rate	3.00%
Minimum
Summary Of Significant Accounting Policies [Line Items]
Operating lease remaining term	1 year	1 year
Maximum
Summary Of Significant Accounting Policies [Line Items]
Operating lease remaining term	5 years	5 years
Concentration of Credit Risk | Accounts Receivable, Net
Summary Of Significant Accounting Policies [Line Items]
Number of major customers | Customer	2	1
Concentration of Credit Risk | Customer One | Accounts Receivable, Net
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	10.80%	17.40%
Concentration of Credit Risk | Customer Two | Accounts Receivable, Net
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	10.10%