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Other Financial Information (Details) (USD $)
Mar. 31, 2014
Sep. 30, 2013
Accrued expenses    
Accrued salaries and benefits $ 360,300,000 $ 410,600,000
Accrued contract costs 385,700,000 404,200,000
Other accrued expenses 77,800,000 100,500,000
Total accrued expenses 823,763,000 915,282,000
Accrued contract costs related to professional liability accruals 121,100,000 121,300,000
Other long-term liabilities    
Pension liabilities (Note 7) 186,600,000 192,700,000
Reserve for uncertain tax positions 59,200,000 60,200,000
Other 198,500,000 196,000,000
Total other long-term liabilities $ 444,265,000 $ 448,920,000