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Segment Information - Revenues by Geographic Region (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Schedule of Revenues by Geographic Region [Line Items]        
Revenue from contract with customer, excluding assessed tax $ 681,354 $ 703,175 $ 1,373,951 $ 1,403,553
United States        
Schedule of Revenues by Geographic Region [Line Items]        
Revenue from contract with customer, excluding assessed tax 363,847 359,906 713,922 735,654
Other Americas [Member]        
Schedule of Revenues by Geographic Region [Line Items]        
Revenue from contract with customer, excluding assessed tax 21,718 23,197 48,033 49,607
Total Americas        
Schedule of Revenues by Geographic Region [Line Items]        
Revenue from contract with customer, excluding assessed tax 385,565 383,103 761,955 785,261
EMEA        
Schedule of Revenues by Geographic Region [Line Items]        
Revenue from contract with customer, excluding assessed tax 178,386 190,439 371,749 374,554
APAC        
Schedule of Revenues by Geographic Region [Line Items]        
Revenue from contract with customer, excluding assessed tax $ 117,403 $ 129,633 $ 240,247 $ 243,738