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Fair Value Measurements - Fair Value Assets Measured on a Non-recurring Basis (Details) (Fair Value, Measurements, Nonrecurring, USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Sep. 30, 2011
--- | --- | ---
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Development projects in progress | $ 0 | $ 0
Land held for sale | 0 |
Right to purchase land |  | 0
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Development projects in progress | 0 | 0
Land held for sale | 0 |
Right to purchase land |  | 0
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Development projects in progress | 20,857 | 49,759
Land held for sale | 1,973 |
Right to purchase land |  | 11,651
Total |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Development projects in progress | 20,857 | 49,759
Land held for sale | 1,973 |
Right to purchase land |  | $ 11,651

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