Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net earnings	$ 68,838	$ 57,191
Other comprehensive (loss) income:
Foreign currency translation adjustments	(4,509)	25,007
Interest rate caps, net of tax	278	175
Foreign exchange contracts, net of tax	480	(1,594)
Other comprehensive (loss) income, net of tax	(3,751)	23,588
Total comprehensive income	$ 65,087	$ 80,779