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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 197,989	$ 154,979	$ 74,634
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(4,476)	(300)	1,498
Interest rate swap contract	1,022	119
Total other comprehensive income (loss), net of tax	(3,454)	(181)	1,498
Comprehensive income	$ 194,535	$ 154,798	$ 76,132

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