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Other Financial Information (Details) (USD $)
Sep. 30, 2014
Sep. 30, 2013
Accrued expenses    
Accrued salaries and benefits $ 400,600,000 $ 410,600,000
Accrued contract costs 446,400,000 404,200,000
Other accrued expenses 117,600,000 100,500,000
Total accrued expenses 964,627,000 915,282,000
Accrued contract costs related to professional liability accruals 120,200,000 121,300,000
Other long-term liabilities    
Pension liabilities (Note 8) 221,300,000 192,700,000
Reserve for uncertain tax positions (Note 17) 52,600,000 60,200,000
Other 181,700,000 196,000,000
Total other long-term liabilities $ 455,563,000 $ 448,920,000