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v3.23.3

Fair Value Measurements - Fair Value Measurement on Company's Assets and Liabilities (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Available-for-sale securities: |  |
Debt Securities, Available-for-Sale | $ 530,805 | $ 510,965
Money Market Funds [Member] |  |
Available-for-sale securities: |  |
Debt Securities, Available-for-Sale | 308,354 | 266,362
Corporate Bonds [Member] |  |
Available-for-sale securities: |  |
Debt Securities, Available-for-Sale | 150,310 | 168,308
U.S. Government Treasuries [Member] |  |
Available-for-sale securities: |  |
Debt Securities, Available-for-Sale | 41,138 | 40,229
Municipal Bonds [Member] |  |
Available-for-sale securities: |  |
Debt Securities, Available-for-Sale | 7,096 | 16,125
Supranational and Sovereign Debt [Member] |  |
Available-for-sale securities: |  |
Debt Securities, Available-for-Sale | 16,792 | 10,594
Asset Backed Obligations [Member] |  |
Available-for-sale securities: |  |
Debt Securities, Available-for-Sale | 7,115 | 9,347
Recurring [Member] |  |
Available-for-sale securities: |  |
Debt Securities, Available-for-Sale | 530,805 | 510,965
Equity Investments | 47,985 | 46,015
Net fair value | (36,832) | (48,901)
Other liabilities | (24,627) | (23,390)
Total | 517,331 | 484,689
Recurring [Member] | Money Market Funds [Member] |  |
Available-for-sale securities: |  |
Debt Securities, Available-for-Sale | 308,354 | 266,362
Recurring [Member] | Corporate Bonds [Member] |  |
Available-for-sale securities: |  |
Debt Securities, Available-for-Sale | 150,310 | 168,308
Recurring [Member] | U.S. Government Treasuries [Member] |  |
Available-for-sale securities: |  |
Debt Securities, Available-for-Sale | 41,138 | 40,229
Recurring [Member] | Municipal Bonds [Member] |  |
Available-for-sale securities: |  |
Debt Securities, Available-for-Sale | 7,096 | 16,125
Recurring [Member] | Supranational and Sovereign Debt [Member] |  |
Available-for-sale securities: |  |
Debt Securities, Available-for-Sale | 16,792 | 10,594
Recurring [Member] | Asset Backed Obligations [Member] |  |
Available-for-sale securities: |  |
Debt Securities, Available-for-Sale | 7,115 | 9,347
Level 1 [Member] | Recurring [Member] |  |
Available-for-sale securities: |  |
Debt Securities, Available-for-Sale | 349,492 | 306,591
Total | 349,492 | 306,591
Level 1 [Member] | Recurring [Member] | Money Market Funds [Member] |  |
Available-for-sale securities: |  |
Debt Securities, Available-for-Sale | 308,354 | 266,362
Level 1 [Member] | Recurring [Member] | U.S. Government Treasuries [Member] |  |
Available-for-sale securities: |  |
Debt Securities, Available-for-Sale | 41,138 | 40,229
Level 2 [Member] | Recurring [Member] |  |
Available-for-sale securities: |  |
Debt Securities, Available-for-Sale | 181,313 | 204,374
Net fair value | (36,832) | (48,901)
Total | 144,481 | 155,473
Level 2 [Member] | Recurring [Member] | Corporate Bonds [Member] |  |
Available-for-sale securities: |  |
Debt Securities, Available-for-Sale | 150,310 | 168,308
Level 2 [Member] | Recurring [Member] | Municipal Bonds [Member] |  |
Available-for-sale securities: |  |
Debt Securities, Available-for-Sale | 7,096 | 16,125
Level 2 [Member] | Recurring [Member] | Supranational and Sovereign Debt [Member] |  |
Available-for-sale securities: |  |
Debt Securities, Available-for-Sale | 16,792 | 10,594
Level 2 [Member] | Recurring [Member] | Asset Backed Obligations [Member] |  |
Available-for-sale securities: |  |
Debt Securities, Available-for-Sale | 7,115 | 9,347
Level 3 [Member] | Recurring [Member] |  |
Available-for-sale securities: |  |
Equity Investments | 47,985 | 46,015
Other liabilities | (24,627) | (23,390)
Total | $ 23,358 | $ 22,625

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