Real Estate and Other Activities - Net Assets Acquired (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024
Business Combination [Line Items]
Liabilities assumed	$ 0	$ (2,290)
Total net assets acquired	110,089	105,618
Land and Land Improvements [Member]
Business Combination [Line Items]
Assets acquired	23,375	0
Buildings and Other [Member]
Business Combination [Line Items]
Assets acquired	23,699	0
Investments in Unconsolidated Real Estate Joint Ventures [Member]
Business Combination [Line Items]
Assets acquired	$ 63,015	$ 107,908