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Segment and Geographical Data - Schedule of Revenues by Geographical Region (Details)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
segment
Jun. 30, 2024
USD ($)
Segment Reporting [Abstract]        
Number of operating segments | segment     1  
Segment Reporting Information [Line Items]        
Revenues $ 295.5 $ 272.5 $ 816.4 $ 837.0
United States        
Segment Reporting Information [Line Items]        
Revenues 160.2 143.6 437.1 439.8
International        
Segment Reporting Information [Line Items]        
Revenues $ 135.3 $ 128.9 $ 379.3 $ 397.2