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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

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