Accounts Receivable-Net (Details) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Accounts Receivable-Net
Billed	$ 1,177,600,000	$ 1,207,000,000
Unbilled	1,076,800,000	1,145,100,000
Contract retentions	174,300,000	156,600,000
Total accounts receivable-gross	2,428,700,000	2,508,700,000
Allowance for doubtful accounts	(86,400,000)	(112,800,000)
Total accounts receivable -net	2,342,262,000	2,395,881,000
Period in which unbilled receivables are expected to be billed and collected	12 months	12 months
Sale of trade receivables, outstanding	$ 100,200,000	$ 31,200,000