Organization - Schedule of Business Acquisitions, by Acquisition (Details) ft² in Thousands	Sep. 30, 2023 investment	Sep. 30, 2023 ft²	Sep. 30, 2023 property	Sep. 30, 2022 ft² property
Real Estate Properties [Line Items]
Number of Properties	182		16	142
Rentable Square Feet of Gross Leasable Area (In Square Feet)		15,296		4,532
Oak Street Real Estate Capital Fund IV and V Acquired Predecessor Portfolio
Real Estate Properties [Line Items]
Rentable Square Feet of Gross Leasable Area (In Square Feet)		3,974
Oak Street Real Estate Capital Fund IV and V Acquired Predecessor Portfolio | Series of Individually Immaterial Asset Acquisitions
Real Estate Properties [Line Items]
Number of Properties | property			141
Rentable Square Feet of Gross Leasable Area (In Square Feet)		3,974
1/30/2018 | Manufacturing | Oak Street Real Estate Capital Fund IV and V Acquired Predecessor Portfolio | Series of Individually Immaterial Asset Acquisitions
Real Estate Properties [Line Items]
Number of Properties | property			1
Rentable Square Feet of Gross Leasable Area (In Square Feet)		1,175
7/29/2020 | Casual Dining | Oak Street Real Estate Capital Fund IV and V Acquired Predecessor Portfolio | Series of Individually Immaterial Asset Acquisitions
Real Estate Properties [Line Items]
Number of Properties | property			13
Rentable Square Feet of Gross Leasable Area (In Square Feet)		133
8/4/2020 | Casual Dining | Oak Street Real Estate Capital Fund IV and V Acquired Predecessor Portfolio | Series of Individually Immaterial Asset Acquisitions
Real Estate Properties [Line Items]
Number of Properties | property			40
Rentable Square Feet of Gross Leasable Area (In Square Feet)		404
10/20/2020 | Pharmacy | Oak Street Real Estate Capital Fund IV and V Acquired Predecessor Portfolio | Series of Individually Immaterial Asset Acquisitions
Real Estate Properties [Line Items]
Number of Properties | property			17
Rentable Square Feet of Gross Leasable Area (In Square Feet)		247
10/26/2020 | Home Appliance Manufacturing | Oak Street Real Estate Capital Fund IV and V Acquired Predecessor Portfolio | Series of Individually Immaterial Asset Acquisitions
Real Estate Properties [Line Items]
Number of Properties | property			1
Rentable Square Feet of Gross Leasable Area (In Square Feet)		1,572
12/21/2020 | Manufacturing | Oak Street Real Estate Capital Fund IV and V Acquired Predecessor Portfolio | Series of Individually Immaterial Asset Acquisitions
Real Estate Properties [Line Items]
Number of Properties | property			1
Rentable Square Feet of Gross Leasable Area (In Square Feet)		12
1/20/2021 | Pharmacy | Oak Street Real Estate Capital Fund IV and V Acquired Predecessor Portfolio | Series of Individually Immaterial Asset Acquisitions
Real Estate Properties [Line Items]
Number of Properties | property			13
Rentable Square Feet of Gross Leasable Area (In Square Feet)		194
6/30/2021 | Grocery | Oak Street Real Estate Capital Fund IV and V Acquired Predecessor Portfolio | Series of Individually Immaterial Asset Acquisitions
Real Estate Properties [Line Items]
Number of Properties | property			8
Rentable Square Feet of Gross Leasable Area (In Square Feet)		22
7/15/2021 | Grocery | Oak Street Real Estate Capital Fund IV and V Acquired Predecessor Portfolio | Series of Individually Immaterial Asset Acquisitions
Real Estate Properties [Line Items]
Number of Properties | property			9
Rentable Square Feet of Gross Leasable Area (In Square Feet)		33
7/22/2021 | Grocery | Oak Street Real Estate Capital Fund IV and V Acquired Predecessor Portfolio | Series of Individually Immaterial Asset Acquisitions
Real Estate Properties [Line Items]
Number of Properties | property			27
Rentable Square Feet of Gross Leasable Area (In Square Feet)		94
9/2/2021 | Grocery | Oak Street Real Estate Capital Fund IV and V Acquired Predecessor Portfolio | Series of Individually Immaterial Asset Acquisitions
Real Estate Properties [Line Items]
Number of Properties | property			6
Rentable Square Feet of Gross Leasable Area (In Square Feet)		26
9/17/2021 | Grocery | Oak Street Real Estate Capital Fund IV and V Acquired Predecessor Portfolio | Series of Individually Immaterial Asset Acquisitions
Real Estate Properties [Line Items]
Number of Properties | property			5
Rentable Square Feet of Gross Leasable Area (In Square Feet)		62