Organization and Background (Details) (Corporate Joint Venture [Member], Property Acquisition [Member], Apartment Building [Member], Maximum [Member])	6 Months Ended
Mar. 31, 2015
Corporate Joint Venture [Member] \| Property Acquisition [Member] \| Apartment Building [Member] \| Maximum [Member]
Organization, background and significant accounting policies
Equity contribution in each transaction (as a percent)	80.00%

Percentage of subsidiary's or equity investee's stock owned by parent company after stock transaction.

No definition available.

Name:	us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration