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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