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Other Financial Information - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2024
Other Financials Information [Line Items] |  |  |
Accrued contract costs including professional liability accruals | $ 1,379,800 |  | $ 1,354,700
Restructuring expenses incurred | $ 0 | $ 16,180 |
Accrued restructuring expenses |  | 5,000 |
Cash dividends declared (in dollars per share) | $ 0.26 |  |
Accrued and unpaid dividend | $ 37,300 |  |
Labor-Related Costs |  |  |
Other Financials Information [Line Items] |  |  |
Restructuring expenses incurred |  | 8,700 |
Non-Labor |  |  |
Other Financials Information [Line Items] |  |  |
Restructuring expenses incurred |  | $ 7,500 |
Professional Liability Accrual |  |  |
Other Financials Information [Line Items] |  |  |
Accrued contract costs including professional liability accruals | $ 833,000 |  | $ 831,800

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