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Fair Value Measurements (Tables)
12 Months Ended
Sep. 30, 2024
Fair Value Disclosures [Abstract]  
Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis
The following table summarizes the fair value of our assets and liabilities that were accounted for at fair value on a recurring basis as of September 30, 2024 (in thousands): 
 Fair Value Measurements at September 30, 2024
Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
Significant Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Fair Value at September 30, 2024
Assets:    
Cash and cash equivalents$315,331 $— $— $315,331 
Short-term investments43,061 — — 43,061 
Rabbi trust assets— 12,324 — 12,324 
Liabilities:    
Deferred compensation— 12,027 — 12,027 
The following table summarizes the fair value of our assets and liabilities that were accounted for at fair value on a recurring basis as of September 30, 2023 (in thousands):  
 Fair Value Measurements at September 30, 2023
Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
Significant Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Fair Value at September 30, 2023
Assets:    
Cash and cash equivalents$245,875 $— $— $245,875 
Short-term investments33,134 — — 33,134 
Rabbi trust assets— 9,117 — 9,117 
Liabilities:    
Deferred compensation— 9,145 — 9,145