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Revenue Recognition - Performance obligations (Details) - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Revenue Recognition    
Performance obligation $ 21,700.0  
Recognized revenue $ 869.5 $ 504.7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-07-01    
Revenue Recognition    
Performance obligation, percent to be satisfied 55.00%  
Performance obligation expected timing of satisfaction period 12 months  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-07-01    
Revenue Recognition    
Performance obligation, percent to be satisfied 45.00%  
Performance obligation expected timing of satisfaction period