v3.26.1
Investments - Fair Value Of Investments Classified as Held-to-Maturity (Details) - Corporate and Government Bonds - USD ($)
$ in Thousands
Jun. 30, 2026
Sep. 30, 2025
Available-for-Sale, Amortized Cost    
Amortized Cost $ 22,645  
Available-for-sale, gross unrealized gains 0  
Available-for-sale, gross unrealized losses (161)  
Available-for-sale, estimated fair market value 22,484  
Held-to-Maturity, Amortized Cost    
Amortized cost, current 17,576 $ 41,784
Amortized cost, noncurrent   4,234
Estimated fair market value, current 17,578 41,813
Estimated fair market value, noncurrent   4,243
Amortized Cost 40,221 46,018
Gross unrealized gains 3 39
Gross unrealized losses (162) (1)
Estimated fair market value 40,062 46,056
Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsCurrent    
Held-to-Maturity, Amortized Cost    
Held-to-maturity, gross unrealized gains 3 30
Held-to-maturity, gross unrealized losses $ (1) (1)
Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsNoncurrent    
Held-to-Maturity, Amortized Cost    
Held-to-maturity, gross unrealized gains   9
Held-to-maturity, gross unrealized losses   $ 0