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Supplemental Cash Flow Information - Supplemental Disclosure of Non-cash Activity (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2010
Supplemental disclosure of non-cash activity: |  |  |
(Decrease) increase in obligations related to land not owned under option agreements | $ (602) | $ (25,277) | $ 4,310
(Decrease) increase in future land purchase rights | (11,651) | 11,651 | 0
Contribution of future land purchase rights to unconsolidated entities | 11,651 | 0 | 0
Increase in repayment guarantee obligation | 0 | 15,670 | 0
Decrease in debt related to conversion of Mandatory Convertible Subordinated Notes and Tangible Equity Units for common stock | (55,308) | 0 | 0
Contribution of pre-owned net assets for investment in unconsolidated entity | (19,670) | 0 | 0
Non-cash land acquisitions | 7,813 | 770 | 515
Issuance of stock under deferred bonus stock plans | 0 | 101 | 2,337
Supplemental disclosure of cash activity: |  |  |
Interest payments | 126,313 | 116,049 | 113,885
Income tax payments | 831 | 405 | 655
Tax refunds received | $ 2,568 | $ 5,823 | $ 135,803

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