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Leases - Summary of Operating Lease Income and Other Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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
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