Organization and Summary of Significant Accounting Policies - Accounting Standards Update and Change in Accounting Principle (Details) - USD ($)	Sep. 30, 2022	Oct. 01, 2021	Sep. 30, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Principal	$ 316,250,000	$ 316,250,000
Unamortized debt discount		0
Deferred financing costs, net		(4,779,000)
Net carrying amount		311,471,000
Deferred tax asset, net	12,145,000	16,353,000	$ 9,746,000
Deferred tax liability, net	373,000	(356,000)	3,684,000
Additional paid-in capital	345,330,000	340,508,000	403,312,000
Retained earnings	$ 402,006,000	$ 352,947,000	326,781,000
As Reported September 30, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Principal			316,250,000
Unamortized debt discount			(48,785,000)
Deferred financing costs, net			(3,279,000)
Net carrying amount			264,186,000
Deferred tax asset, net			9,746,000
Deferred tax liability, net			3,684,000
Additional paid-in capital			403,312,000
Retained earnings			326,781,000
Adjustments | Accounting Standards Update 2020-06
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Principal			0
Unamortized debt discount			48,785,000
Deferred financing costs, net			(1,500,000)
Net carrying amount			47,285,000
Deferred tax asset, net			6,607,000
Deferred tax liability, net			(4,040,000)
Additional paid-in capital			(62,804,000)
Retained earnings			$ 26,166,000