Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Assets and Liabilities (Details)

v3.22.2.2
Fair Value Measurements - Assets and Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Financial information for each of the Company's business segments      
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration] Amortization of Intangible Assets Amortization of Intangible Assets Amortization of Intangible Assets
Fair Value, Recurring      
Financial information for each of the Company's business segments      
Total assets $ 54,178    
Contingent consideration 16,236    
Total liabilities 16,236    
Fair Value, Recurring | Interest rate swap      
Financial information for each of the Company's business segments      
Total assets 31,409    
Fair Value, Recurring | Deferred compensation assets - Rabbi Trust      
Financial information for each of the Company's business segments      
Total assets 22,769    
Level 1 | Fair Value, Recurring      
Financial information for each of the Company's business segments      
Total assets 22,769    
Contingent consideration 0    
Total liabilities 0    
Level 1 | Fair Value, Recurring | Interest rate swap      
Financial information for each of the Company's business segments      
Total assets 0    
Level 1 | Fair Value, Recurring | Deferred compensation assets - Rabbi Trust      
Financial information for each of the Company's business segments      
Total assets 22,769    
Level 2 | Fair Value, Recurring      
Financial information for each of the Company's business segments      
Total assets 31,409    
Contingent consideration 0    
Total liabilities 0    
Level 2 | Fair Value, Recurring | Interest rate swap      
Financial information for each of the Company's business segments      
Total assets 31,409    
Level 2 | Fair Value, Recurring | Deferred compensation assets - Rabbi Trust      
Financial information for each of the Company's business segments      
Total assets 0    
Level 3 | Fair Value, Recurring      
Financial information for each of the Company's business segments      
Total assets 0    
Contingent consideration 16,236    
Total liabilities 16,236    
Level 3 | Fair Value, Recurring | Interest rate swap      
Financial information for each of the Company's business segments      
Total assets 0    
Level 3 | Fair Value, Recurring | Deferred compensation assets - Rabbi Trust      
Financial information for each of the Company's business segments      
Total assets 0    
U.S. Services and Outside the U.S. Services      
Financial information for each of the Company's business segments      
Impairment of long-lived assets held-for-use $ 0 $ 12,500 $ 1,200