Annual report [Section 13 and 15(d), not S-K Item 405]

Summary of Significant Accounting Policies - Schedule of disaggregation of revenue (Details)

v3.25.3
Summary of Significant Accounting Policies - Schedule of disaggregation of revenue (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Disaggregation of Revenue [Line Items]    
Total operating revenues $ 44,066 $ 46,643
Revenue recognized at a point-in-time    
Disaggregation of Revenue [Line Items]    
Total operating revenues 42,253 42,233
Revenue recognized over time    
Disaggregation of Revenue [Line Items]    
Total operating revenues $ 1,813 $ 4,410