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Leases - Summary of Operating Lease Income and Other Income (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Operating leases:    
Operating lease income $ 9,780 $ 1,285
Variable lease income 526 843
Total rental income $ 10,306 $ 2,128
Operating Lease Income Comprehensive Income Extensible List Not Disclosed Flag true true