Derivative Financial Instruments - Schedule of Pretax Amounts Recognized in Accumulated Other Comprehensive Loss ("AOCL") for Designated Hedge Derivative Instruments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Beginning unrealized net (loss) gain in AOCL	$ (135)		$ 183
Net gain (loss) recognized in other comprehensive (loss) income	149	$ 607	(45)	$ (141)
Net gain reclassified into interest expense	$ (61)	$ (39)	$ (185)	$ (19)
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, after Tax	Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, after Tax	Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, after Tax	Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, after Tax
Ending unrealized (loss) gain in AOCL	$ (47)	$ 568	$ (47)	$ 568
Ending unrealized (loss) gain in AOCL		$ (160)		$ (160)