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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Sep. 30, 2024
Assets:    
Cash and cash equivalents $ 450,739 $ 315,331
Short-term investments 24,788 43,061
Liabilities:    
Deferred compensation 13,707 12,027
Contingent future payments related to the acquisition of Remsdaq 2,344  
Rabbi trust assets    
Assets:    
Rabbi trust assets 13,931 12,324
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Cash and cash equivalents 450,739 315,331
Short-term investments 24,788 43,061
Liabilities:    
Deferred compensation 0 0
Contingent future payments related to the acquisition of Remsdaq 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Rabbi trust assets    
Assets:    
Rabbi trust assets 0 0
Significant Other Observable Inputs (Level 2)    
Assets:    
Cash and cash equivalents 0 0
Short-term investments 0 0
Liabilities:    
Deferred compensation 13,707 12,027
Contingent future payments related to the acquisition of Remsdaq 0  
Significant Other Observable Inputs (Level 2) | Rabbi trust assets    
Assets:    
Rabbi trust assets 13,931 12,324
Significant Unobservable Inputs (Level 3)    
Assets:    
Cash and cash equivalents 0 0
Short-term investments 0 0
Liabilities:    
Deferred compensation 0 0
Contingent future payments related to the acquisition of Remsdaq 2,344  
Significant Unobservable Inputs (Level 3) | Rabbi trust assets    
Assets:    
Rabbi trust assets $ 0 $ 0