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Unconsolidated Affiliates and Noncontrolling Interests - Variable Interest Entities (Details) - USD ($)	Mar. 31, 2019	Sep. 30, 2018
Ambassador Infrastructure, LLC
Noncontrolling Interest [Line Items]
Investment in Real Estate Joint Ventures and Partnerships	$ 0
Maximum Risk of Loss	$ 10,605,000
Debt guaranteed (as a percent)	100.00%
EastGate Storage, LLC
Noncontrolling Interest [Line Items]
Investment in Real Estate Joint Ventures and Partnerships	$ 1,052,000
Maximum Risk of Loss	6,500,000
G&I VIII CBL Triangle LLC
Noncontrolling Interest [Line Items]
Investment in Real Estate Joint Ventures and Partnerships	0
Maximum Risk of Loss	0
Equity interest in real estate property (as a percent)		90.00%
Self Storage at Mid Rivers, LLC
Noncontrolling Interest [Line Items]
Investment in Real Estate Joint Ventures and Partnerships	1,022,000
Maximum Risk of Loss	5,987,000
Shoppes at Eagle Point, LLC
Noncontrolling Interest [Line Items]
Investment in Real Estate Joint Ventures and Partnerships	16,295,000
Maximum Risk of Loss	$ 12,740,000

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Real Estate Investment, Maximum Loss

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
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The book value of investments in real estate joint ventures including direct and indirect investments.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(d))
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