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Fair Value Measurements - Fair Value Measurement on Company's Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2024
Sep. 30, 2023
Available-for-sale securities:    
Available-for-sale securities $ 311,162 [1] $ 530,805 [2]
Money Market Funds [Member]    
Available-for-sale securities:    
Available-for-sale securities 142,920 308,354
Corporate Bonds [Member]    
Available-for-sale securities:    
Available-for-sale securities 108,420 150,310
U.S. Government Treasuries [Member]    
Available-for-sale securities:    
Available-for-sale securities 35,533 41,138
Municipal Bond [Member]    
Available-for-sale securities:    
Available-for-sale securities 4,191 7,096
Supranational and Sovereign Debt [Member]    
Available-for-sale securities:    
Available-for-sale securities 16,660 16,792
Asset Backed Obligations [Member]    
Available-for-sale securities:    
Available-for-sale securities 3,438 7,115
Recurring [Member]    
Available-for-sale securities:    
Available-for-sale securities 311,162 530,805
Equity Investments 42,190 47,985
Derivative financial instruments, net (6,380) (36,832)
Other liabilities (52,139) (24,627)
Total 294,833 517,331
Recurring [Member] | Money Market Funds [Member]    
Available-for-sale securities:    
Available-for-sale securities 142,920 308,354
Recurring [Member] | Corporate Bonds [Member]    
Available-for-sale securities:    
Available-for-sale securities 108,420 150,310
Recurring [Member] | U.S. Government Treasuries [Member]    
Available-for-sale securities:    
Available-for-sale securities 35,533 41,138
Recurring [Member] | Municipal Bond [Member]    
Available-for-sale securities:    
Available-for-sale securities 4,191 7,096
Recurring [Member] | Supranational and Sovereign Debt [Member]    
Available-for-sale securities:    
Available-for-sale securities 16,660 16,792
Recurring [Member] | Asset Backed Obligations [Member]    
Available-for-sale securities:    
Available-for-sale securities 3,438 7,115
Level 1 [Member] | Recurring [Member]    
Available-for-sale securities:    
Available-for-sale securities 178,453 349,492
Equity Investments 0 0
Derivative financial instruments, net 0 0
Other liabilities 0 0
Total 178,453 349,492
Level 1 [Member] | Recurring [Member] | Money Market Funds [Member]    
Available-for-sale securities:    
Available-for-sale securities 142,920 308,354
Level 1 [Member] | Recurring [Member] | Corporate Bonds [Member]    
Available-for-sale securities:    
Available-for-sale securities 0 0
Level 1 [Member] | Recurring [Member] | U.S. Government Treasuries [Member]    
Available-for-sale securities:    
Available-for-sale securities 35,533 41,138
Level 1 [Member] | Recurring [Member] | Municipal Bond [Member]    
Available-for-sale securities:    
Available-for-sale securities 0 0
Level 1 [Member] | Recurring [Member] | Supranational and Sovereign Debt [Member]    
Available-for-sale securities:    
Available-for-sale securities 0 0
Level 1 [Member] | Recurring [Member] | Asset Backed Obligations [Member]    
Available-for-sale securities:    
Available-for-sale securities 0 0
Level 2 [Member] | Recurring [Member]    
Available-for-sale securities:    
Available-for-sale securities 132,709 181,313
Equity Investments 0 0
Derivative financial instruments, net (6,380) (36,832)
Other liabilities 0 0
Total 126,329 144,481
Level 2 [Member] | Recurring [Member] | Money Market Funds [Member]    
Available-for-sale securities:    
Available-for-sale securities 0 0
Level 2 [Member] | Recurring [Member] | Corporate Bonds [Member]    
Available-for-sale securities:    
Available-for-sale securities 108,420 150,310
Level 2 [Member] | Recurring [Member] | U.S. Government Treasuries [Member]    
Available-for-sale securities:    
Available-for-sale securities 0 0
Level 2 [Member] | Recurring [Member] | Municipal Bond [Member]    
Available-for-sale securities:    
Available-for-sale securities 4,191 7,096
Level 2 [Member] | Recurring [Member] | Supranational and Sovereign Debt [Member]    
Available-for-sale securities:    
Available-for-sale securities 16,660 16,792
Level 2 [Member] | Recurring [Member] | Asset Backed Obligations [Member]    
Available-for-sale securities:    
Available-for-sale securities 3,438 7,115
Level 3 [Member] | Recurring [Member]    
Available-for-sale securities:    
Available-for-sale securities 0 0
Equity Investments 42,190 47,985
Derivative financial instruments, net 0 0
Other liabilities (52,139) (24,627)
Total (9,949) 23,358
Level 3 [Member] | Recurring [Member] | Money Market Funds [Member]    
Available-for-sale securities:    
Available-for-sale securities 0 0
Level 3 [Member] | Recurring [Member] | Corporate Bonds [Member]    
Available-for-sale securities:    
Available-for-sale securities 0 0
Level 3 [Member] | Recurring [Member] | U.S. Government Treasuries [Member]    
Available-for-sale securities:    
Available-for-sale securities 0 0
Level 3 [Member] | Recurring [Member] | Municipal Bond [Member]    
Available-for-sale securities:    
Available-for-sale securities 0 0
Level 3 [Member] | Recurring [Member] | Supranational and Sovereign Debt [Member]    
Available-for-sale securities:    
Available-for-sale securities 0 0
Level 3 [Member] | Recurring [Member] | Asset Backed Obligations [Member]    
Available-for-sale securities:    
Available-for-sale securities $ 0 $ 0
[1] Available-for-sale securities with maturities longer than 90 days from the date of acquisition were classified as short-term interest-bearing investments and available-for-sale securities with maturities of 90 days or less from the date of acquisition were included in cash and cash equivalents on the Company’s consolidated balance sheets. As of September 30, 2024, $168,242 of securities were classified as short-term interest-bearing investments and $142,920 of securities were classified as cash and cash equivalents.
[2] Available-for-sale securities with maturities longer than 90 days from the date of acquisition were classified as short-term interest-bearing investments and available-for-sale securities with maturities of 90 days or less from the date of acquisition were included in cash and cash equivalents on the Company’s consolidated balance sheets. As of September 30, 2023, $222,451 of securities were classified as short-term interest-bearing investments and $308,354 of securities were classified as cash and cash equivalents.