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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 154,979	$ 74,634	$ 35,985
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(300)	1,498	(669)
Interest rate swap contract	119
Total other comprehensive (loss) income, net of tax	(181)	1,498	(669)
Comprehensive income	$ 154,798	$ 76,132	$ 35,316

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