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Fair Value Measurements - Fair Value Measurement on Company's Assets and Liabilities (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | $ 465,553 | $ 559,385
Money Market Funds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 209,026 | 558,633
Corporate Bonds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 190,437 | 752
U.S. Government Treasuries [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 54,752 |
Asset Backed Obligations [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 3,885 |
Supranational and Sovereign Debt [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 7,453 |
Recurring [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 465,553 | 559,385
Equity Investments | 37,581 | 24,211
Derivative financial instruments, net | 10,979 | 20,636
Other liabilities | (51,590) | (19,641)
Total | 462,523 | 584,591
Recurring [Member] | Money Market Funds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 209,026 | 558,633
Recurring [Member] | Corporate Bonds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 190,437 | 752
Recurring [Member] | U.S. Government Treasuries [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 54,752 |
Recurring [Member] | Asset Backed Obligations [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 3,885 |
Recurring [Member] | Supranational and Sovereign Debt [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 7,453 |
Level 1 [Member] | Recurring [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 263,778 | 558,633
Total | 263,778 | 558,633
Level 1 [Member] | Recurring [Member] | Money Market Funds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 209,026 | 558,633
Level 1 [Member] | Recurring [Member] | U.S. Government Treasuries [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 54,752 |
Level 2 [Member] | Recurring [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 201,775 | 752
Derivative financial instruments, net | 10,979 | 20,636
Total | 212,754 | 21,388
Level 2 [Member] | Recurring [Member] | Corporate Bonds [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 190,437 | 752
Level 2 [Member] | Recurring [Member] | Asset Backed Obligations [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 3,885 |
Level 2 [Member] | Recurring [Member] | Supranational and Sovereign Debt [Member] |  |
Available-for-sale securities: |  |
Fair value, Measured on recurring basis, Investments | 7,453 |
Level 3 [Member] | Recurring [Member] |  |
Available-for-sale securities: |  |
Equity Investments | 37,581 | 24,211
Other liabilities | (51,590) | (19,641)
Total | $ (14,009) | $ 4,570

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