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Subsequent Event (Notes)	3 Months Ended
Subsequent Event (Notes)	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events [Text Block]	SUBSEQUENT EVENT On February 8, 2018, the Forestar land development segment sold a portion of its legacy assets, owned both directly and indirectly through ventures, for $232 million. The carrying value of these assets was included in land held for sale and investment in unconsolidated entities in the consolidated balance sheet as of December 31, 2017. The transaction will not have a material impact on the Company’s fiscal 2018 earnings.