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Segment and Geographic Information - Revenue By Geographic Segment (Parenthetical) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Total revenue $ 1,807,159 $ 1,458,415 $ 1,255,631
United States      
Total revenue 741,300 621,800 514,400
Germany      
Total revenue $ 290,700 $ 198,700 $ 185,400