Derivative Financial Instruments - Effect of Derivative Instruments on the Consolidated Statement of Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Derivatives designated as hedging instruments: | Interest rate swap contract | Interest expense, net
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Loss Recognized in Statement of Income (Loss)	$ (792)	$ (809)	$ (1,583)	$ (3,254)
Derivatives designated as hedging instruments: | Terminated interest rate swap contract | Interest expense, net
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Loss Recognized in Statement of Income (Loss)	(2,786)	(2,786)	(5,572)	(3,715)
Derivatives not designated as hedging instruments: | Foreign exchange contracts | Other (expense) income, net
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Loss Recognized in Statement of Income (Loss)	$ (673)	$ (759)	$ (1,385)	$ (637)