Commitments and Contingencies (Details Textual) (USD $)	3 Months Ended	9 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Jun. 30, 2012	Sep. 30, 2012
Commitments and Contingencies [Abstract]
Surety Bonds	$ 671,000,000	$ 671,000,000
Outstanding letters of credit	59,100,000	59,100,000
Cash Collateral On Letters Of Credit	64,000,000	64,000,000		47,200,000
Homebuilding [Member]
Commitments and Contingencies [Abstract]
Liabilities for various claims, complaints and other legal actions	508,300,000	508,300,000		544,900,000
Expenses related to legal claims		13,300,000	29,500,000
Estimated insurance recoveries related to legal claims	192,800,000	192,800,000		225,000,000
Earnest Money Deposits	39,400,000	39,400,000
Remaining purchase price of land under option contracts	2,100,000,000	2,100,000,000
Land and lot option purchase contracts remaining purchase obligation subject to specific performance clauses	25,300,000	25,300,000
Limited warranty for major defects in structural components and foundation systems	10 years
Limited warranty on major mechanical systems	2 years
Limited warranty on other construction components	1 year
Construction defect portion of loss contingency accrual	99.00%	99.00%		99.00%
Cash Deposits [Member] | Homebuilding [Member]
Commitments and Contingencies [Abstract]
Earnest Money Deposits	35,400,000	35,400,000
Promissory Notes and Surety Bonds [Member] | Homebuilding [Member]
Commitments and Contingencies [Abstract]
Earnest Money Deposits	4,000,000	4,000,000
Letter of Credit Two [Member]
Commitments and Contingencies [Abstract]
Outstanding letters of credit	7,900,000	7,900,000
Letter of Credit One [Member]
Commitments and Contingencies [Abstract]
Outstanding letters of credit	$ 51,200,000	$ 51,200,000