Derivatives and Hedging Activities - Schedule of Effects of Derivative Instruments on Consolidated Statements of Operations (Detail) - Derivatives Not Designated As Hedging Instrument [Member] - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Amount of Gain (Loss) Recognized in Income on derivatives	$ 1	$ (3)
Interest Rate Swap Agreements [Member] | Other Income [Member]
Amount of Gain (Loss) Recognized in Income on derivatives	$ 1	$ (3)