v3.26.1
Captive Insurance Collateral - Schedule of Maturities of Investments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2026
Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract]    
Due within one year $ 80,385  
Due after one year through five years 0  
Due after five years through ten years 0  
Total $ 80,385 $ 78,189