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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]    
Net income $ 23,600 $ 9,059
Other comprehensive (loss) gain, net of tax:    
Foreign currency translation adjustments 1,115 606
Interest rate swap contract (195)  
Total other comprehensive income, net of tax 920 606
Comprehensive income $ 24,520 $ 9,665