Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Composition of Certain Financial Statement Captions - Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2022	Sep. 30, 2021
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment Impairment or Disposal Disclosure	$ 5,200
Property, Plant and Equipment [Line Items]
Less: accumulated depreciation and amortization		$ (94,831)	$ (97,053)
Property and equipment, net		17,580	27,913
Technology Equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		76,335	86,144
Office Equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		14,790	16,754
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		$ 21,286	$ 22,068