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, 2014		Sep. 30, 2013
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale marketable equity securities	$ 24,765
Deferred compensation plan assets	0		0
Development projects in progress	0	[1]	0	[1]
Land held for sale	0	[1]	0	[1]
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale marketable equity securities	0
Deferred compensation plan assets	517		653
Development projects in progress	0	[1]	0	[1]
Land held for sale	0	[1]	0	[1]
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale marketable equity securities	0
Deferred compensation plan assets	0		0
Development projects in progress	14,379	[1],[2]	0	[1]
Land held for sale	4,117	[1]	4,072	[1]
Total
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale marketable equity securities	24,765
Deferred compensation plan assets	517		653
Development projects in progress	14,379	[1]	0	[1]
Land held for sale	$ 4,117	[1]	$ 4,072	[1]

[1] Measured at fair value on a non-recurring basis.

[2] During the year ended September 30, 2014, we recorded an impairment charge of $0.1 million in our East segment. The community had less than 10 lots remaining to close at the time of the analysis and therefore, consistent with our policy, we did not prepare an undiscounted or discounted cash flow analysis related to this community.