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Other Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023	Mar. 21, 2024	Sep. 30, 2023
Accrued expenses and other current liabilities
Accrued salaries and benefits	$ 569,600		$ 569,600			$ 599,800
Accrued contract costs	1,416,700		1,416,700			1,340,400
Other accrued expenses	398,900		398,900			347,300
Total	2,385,201		2,385,201			2,287,546
Restructuring costs	35,465	$ 3,973	51,645	$ 41,432
Accrued restructuring expenses	7,300	$ 30,700	7,300	30,700
Dividend paid per share in cash					$ 0.22
Accrued and unpaid dividend	32,100		32,100
Personnel and other costs
Accrued expenses and other current liabilities
Restructuring costs			38,600	39,000
Real estate costs
Accrued expenses and other current liabilities
Restructuring costs			13,000	$ 2,400
Professional liability accrual
Accrued expenses and other current liabilities
Accrued contract costs	$ 793,800		$ 793,800			$ 809,600

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for obligations related to professional liability and costs for services provided by subcontractors and other non-employees. It is used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle, whichever is longer).

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