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		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Beginning unrealized net (loss) gain in AOCL	$ (499)		$ 183
Net gain (loss) recognized in other comprehensive (loss) income	426	$ (304)	(194)	$ (748)
Net (gain) loss reclassified into interest expense	$ (62)	$ (11)	$ (124)	$ 20
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 in AOCL	$ (135)	$ (315)	$ (135)	$ (315)
Ending unrealized loss in AOCL		$ (728)		$ (728)