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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]        
Net income $ 59,618 $ 34,927 $ 122,153 $ 49,051
Other comprehensive gain (loss), net of tax:        
Foreign currency translation adjustments 260 383 343 539
Interest rate swap contract (101)   92  
Total other comprehensive income, net of tax 159 383 435 539
Comprehensive income $ 59,777 $ 35,310 $ 122,588 $ 49,590