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
	Dec. 31, 2023	Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Beginning unrealized net gain in AOCL	$ 183
Net loss recognized in other comprehensive income (loss)	(620)	$ (444)
Net (gain) loss reclassified into interest expense	$ (62)	$ 31
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
Ending unrealized loss in AOCL	$ (499)	$ (413)