Segment Information (Details Textuals) - Homebuilding [Member]	3 Months Ended	12 Months Ended
Sep. 30, 2016 Market State Segments OperatingDivisions	Sep. 30, 2016 Market State	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Number of homebuilding operating divisions \| OperatingDivisions	39
Number of homebuilding reporting segments \| Segments	6
Homebuilding percentage of consolidated revenues		98.00%	98.00%	98.00%
Number of housing construction states \| State	26	26
Number of housing construction markets \| Market	78	78

Homebuilding revenues expressed as a percentage of consolidated revenues.

No definition available.

Name:	dhi_HomebuildingPercentageOfConsolidatedRevenues
Namespace Prefix:	dhi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of markets the entity operates in as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	dhi_NumberOfHousingConstructionMarkets
Namespace Prefix:	dhi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfOperatingSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_SegmentReportingInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=dhi_HomebuildingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: