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Investments & Fair Value Measurements - AFS Maturities (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Sep. 30, 2022
Amortized Cost    
Due within 1 year $ 218,820 $ 336,291
Due in 1 to 2 years 59,149 53,721
Due in 2 to 5 years 33,090 42,122
Total 311,059 432,134
Fair Value    
Due within 1 year 217,487 334,537
Due in 1 to 2 years 57,449 51,332
Due in 2 to 5 years 33,127 40,280
Debt Securities, Available-for-sale $ 308,063 $ 426,149