Investments in Marketable Securities and Unconsolidated Entities - Outstanding Borrowings of Unconsolidated Entities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2014
Schedule of Equity Method Investments [Line Items]
Unrealized gain related to available-for-sale securities	$ 206	$ 0
Beazer’s investment in unconsolidated entities	34,735		38,341
Unconsolidated Entities
Schedule of Equity Method Investments [Line Items]
Beazer’s investment in unconsolidated entities	9,765		13,576
Total equity of unconsolidated entities	47,090		59,336
Total outstanding borrowings of unconsolidated entities	$ 10,424		$ 11,254

Equity Method Investment, Summarized Financial Information, Borrowings

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- Definition

Amount of equity, including noncontrolling interest, reported by an equity method investment of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

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-Name Accounting Standards Codification

-Topic 235

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- Definition

Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

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- Definition

The aggregate net change in the difference between the fair value and the carrying value, or in the comparative fair values, of marketable securities categorized as trading held at each balance sheet date, that was included in earnings for the period, which may have arisen from (a) securities classified as trading, (b) the unrealized holding gain (loss) on held-to-maturity securities transferred to the trading security category, and (c) the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) on available-for-sale securities transferred to trading securities during the period.

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-Topic 320

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