INVESTMENTS IN OPERATING PARTNERSHIPS - Operating Partnerships within the Fund (Details) - Partnership	Sep. 30, 2023	Sep. 30, 2022
INVESTMENTS IN OPERATING PARTNERSHIPS
Number of operating partnerships	3	7
Series 29
INVESTMENTS IN OPERATING PARTNERSHIPS
Number of operating partnerships		1
Series 34
INVESTMENTS IN OPERATING PARTNERSHIPS
Number of operating partnerships	1	1
Series 45
INVESTMENTS IN OPERATING PARTNERSHIPS
Number of operating partnerships		1
Series 46
INVESTMENTS IN OPERATING PARTNERSHIPS
Number of operating partnerships	2	4