Derivative Financial Instruments - Schedule of Pretax Amounts Recognized in AOCL on Interest Rate Swap (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jun. 30, 2023	Jun. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in other comprehensive income (loss)	$ 607	$ (141)
Net (gain) loss reclassified into interest expense	(39)	(19)
Ending unrealized net gain (loss) in AOCL	$ 568	$ (160)

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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- Definition

Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

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Amount, after tax and before adjustments, of gain (loss) from increase (decrease) in value of excluded component of derivative designated and qualifying as hedge. Adjustments include, but are not limited to, reclassifications for sale and settlement, and amounts recognized under systematic and rational method.

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