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Fair Value - Assets and Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Financial information for each of the Company's business segments |  |  |
Debt fair value | $ 1,510,000 | $ 28,900 |
Fair Value, Recurring |  |  |
Financial information for each of the Company's business segments |  |  |
Total assets | 28,516 |  |
Contingent consideration | 270 |  |
Total liabilities | 680 |  |
Fair Value, Recurring | Deferred compensation assets - Rabbi Trust |  |  |
Financial information for each of the Company's business segments |  |  |
Total assets | 28,516 |  |
Fair Value, Recurring | Interest Rate Swap |  |  |
Financial information for each of the Company's business segments |  |  |
Interest rate swap | 410 |  |
Level 1 | Fair Value, Recurring |  |  |
Financial information for each of the Company's business segments |  |  |
Total assets | 28,516 |  |
Contingent consideration | 0 |  |
Total liabilities | 0 |  |
Level 1 | Fair Value, Recurring | Deferred compensation assets - Rabbi Trust |  |  |
Financial information for each of the Company's business segments |  |  |
Total assets | 28,516 |  |
Level 1 | Fair Value, Recurring | Interest Rate Swap |  |  |
Financial information for each of the Company's business segments |  |  |
Interest rate swap | 0 |  |
Level 2 | Fair Value, Recurring |  |  |
Financial information for each of the Company's business segments |  |  |
Total assets | 0 |  |
Contingent consideration | 0 |  |
Total liabilities | 410 |  |
Level 2 | Fair Value, Recurring | Deferred compensation assets - Rabbi Trust |  |  |
Financial information for each of the Company's business segments |  |  |
Total assets | 0 |  |
Level 2 | Fair Value, Recurring | Interest Rate Swap |  |  |
Financial information for each of the Company's business segments |  |  |
Interest rate swap | 410 |  |
Level 3 | Fair Value, Recurring |  |  |
Financial information for each of the Company's business segments |  |  |
Total assets | 0 |  |
Contingent consideration | 270 |  |
Total liabilities | 270 |  |
Level 3 | 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 | Interest Rate Swap |  |  |
Financial information for each of the Company's business segments |  |  |
Interest rate swap | 0 |  |
U.S. Services |  |  |
Financial information for each of the Company's business segments |  |  |
Impairment of long-lived assets held-for-use | $ 12,500 | $ 1,200 | $ 3,700

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