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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]    
Net income $ 9,059 $ 4,910
Other comprehensive gain, net of tax:    
Foreign currency translation adjustments 606  
Total other comprehensive gain, net of tax 606  
Comprehensive income $ 9,665 $ 4,910