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Fair Value Measurements - Fair Value Measurement on Company's Assets and Liabilities (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | ---
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | $ 510,965 | $ 465,553
Money Market Funds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 266,362 | 209,026
Corporate Bonds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 168,308 | 190,437
U.S. Government Treasuries [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 40,229 | 54,752
Municipal Bonds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 16,125 |
Supranational and Sovereign Debt [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 10,594 | 7,453
Asset Backed Obligations [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 9,347 | 3,885
Recurring [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 510,965 | 465,553
Equity Investments | 46,015 | 37,581
Derivative financial instruments, net | (48,901) | 10,979
Other liabilities | (23,390) | (51,590)
Total | 484,689 | 462,523
Recurring [Member] | Money Market Funds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 266,362 | 209,026
Recurring [Member] | Corporate Bonds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 168,308 | 190,437
Recurring [Member] | U.S. Government Treasuries [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 40,229 | 54,752
Recurring [Member] | Municipal Bonds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 16,125 |
Recurring [Member] | Supranational and Sovereign Debt [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 10,594 | 7,453
Recurring [Member] | Asset Backed Obligations [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 9,347 | 3,885
Level 1 [Member] | Recurring [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 306,591 | 263,778
Total | 306,591 | 263,778
Level 1 [Member] | Recurring [Member] | Money Market Funds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 266,362 | 209,026
Level 1 [Member] | Recurring [Member] | U.S. Government Treasuries [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 40,229 | 54,752
Level 2 [Member] | Recurring [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 204,374 | 201,775
Derivative financial instruments, net | (48,901) | 10,979
Total | 155,473 | 212,754
Level 2 [Member] | Recurring [Member] | Corporate Bonds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 168,308 | 190,437
Level 2 [Member] | Recurring [Member] | Municipal Bonds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 16,125 |
Level 2 [Member] | Recurring [Member] | Supranational and Sovereign Debt [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 10,594 | 7,453
Level 2 [Member] | Recurring [Member] | Asset Backed Obligations [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 9,347 | 3,885
Level 3 [Member] | Recurring [Member] |  |
Available-for-sale securities: |  |
Equity Investments | 46,015 | 37,581
Other liabilities | (23,390) | (51,590)
Total | $ 22,625 | $ (14,009)

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