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Available-for-Sale Securities - Interest-bearing Investments in Available-for-Sale Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2025
Sep. 30, 2024
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost [1]   $ 316,400
Gross Unrealized Gains   0
Gross Unrealized Losses [1]   5,238
Fair Value [1]   311,162
Money Market Funds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 118,163 142,920
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value $ 118,163 142,920
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   111,351
Gross Unrealized Gains   0
Gross Unrealized Losses   2,931
Fair Value   108,420
U.S. Government Treasuries [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   36,904
Gross Unrealized Gains   0
Gross Unrealized Losses   1,371
Fair Value   35,533
Supranational and Sovereign Debt [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   17,438
Gross Unrealized Gains   0
Gross Unrealized Losses   778
Fair Value   16,660
Municipal Bond [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   4,317
Gross Unrealized Gains   0
Gross Unrealized Losses   126
Fair Value   4,191
Asset Backed Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   3,470
Gross Unrealized Gains   0
Gross Unrealized Losses   32
Fair Value   $ 3,438
[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, 2025, all the securities were classified as cash and cash equivalents and 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.