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Derivative Financial Instruments - Schedule of Pretax Amounts Recognized in AOCL on Interest Rate Swap (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Mar. 31, 2023 | Mar. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items] |  |
Net loss recognized in other comprehensive income (loss) | $ (304) | $ (748)
Net loss reclassified into interest expense | (11) | 20
Ending unrealized net loss in AOCL | $ (315) | $ (728)

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