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Fair Value Measurements (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Sep. 30, 2022
Sep. 30, 2021
Assets:    
Cash and cash equivalents $ 101,954 $ 114,314
Short-term investments 14,554 19,667
Other assets 7,730 9,100
Liabilities:    
Deferred compensation 7,714 8,527
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Cash and cash equivalents 101,954 114,314
Short-term investments 14,554 19,667
Other assets 0 0
Liabilities:    
Deferred compensation 0 0
Significant Other Observable Inputs (Level 2)    
Assets:    
Cash and cash equivalents 0 0
Short-term investments 0 0
Other assets 7,730 9,100
Liabilities:    
Deferred compensation 7,714 8,527
Significant Unobservable Inputs (Level 3)    
Assets:    
Cash and cash equivalents 0 0
Short-term investments 0 0
Other assets 0 0
Liabilities:    
Deferred compensation $ 0 $ 0