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Other Financial Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Accrued expenses and other current liabilities |  |  |  |  |  |  |  |  |  |  |
Accrued salaries and benefits | $ 661,800 |  |  |  | $ 675,700 |  |  |  | $ 661,800 | $ 675,700 |
Accrued contract costs | 1,202,100 |  |  |  | 1,137,500 |  |  |  | 1,202,100 | 1,137,500 |
Other accrued expenses | 310,300 |  |  |  | 436,500 |  |  |  | 310,300 | 436,500 |
Total accrued expenses | 2,174,201 |  |  |  | 2,249,704 |  |  |  | 2,174,201 | 2,249,704 |
Restructuring costs | 14,000 | $ 13,000 | $ 8,800 | $ 13,000 | 91,900 | $ 20,300 | $ 31,200 | $ 44,900 | 48,840 | 188,345 | $ 95,446
Loss related to remeasurement of self perform at risk construction business to fair value less cost to sell |  |  |  |  |  |  |  |  |  |  | $ 24,900
Accrued restructuring expenses | 5,200 |  |  |  | 56,200 |  |  |  | 5,200 | 56,200 |
Personnel and other costs |  |  |  |  |  |  |  |  |  |  |
Accrued expenses and other current liabilities |  |  |  |  |  |  |  |  |  |  |
Restructuring costs |  |  |  |  |  |  |  |  | 37,800 | 149,200 |
Real estate costs |  |  |  |  |  |  |  |  |  |  |
Accrued expenses and other current liabilities |  |  |  |  |  |  |  |  |  |  |
Restructuring costs |  |  |  |  |  |  |  |  | 11,000 | 39,100 |
Loss related to remeasurement of self perform at risk construction business to fair value less cost to sell |  |  |  |  |  |  |  |  |  | 27,400 |
Professional liability accrual |  |  |  |  |  |  |  |  |  |  |
Accrued expenses and other current liabilities |  |  |  |  |  |  |  |  |  |  |
Accrued contract costs | $ 736,400 |  |  |  | $ 596,000 |  |  |  | $ 736,400 | $ 596,000 |

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