v3.24.3

Credit Risk Concentrations - Additional Information (Detail) - Customer	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Concentration Risk [Line Items]
Lease revenue, net, percentage	10.00%	10.00%
Number of tenants or common franchises	0	0

X

- Definition

Lease revenue, net, percentage

+ References

No definition available.

+ Details

Name:	bnl_LeaseRevenueNetPercentage
Namespace Prefix:	bnl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of major customer.

+ References

No definition available.

+ Details

Name:	bnl_NumberOfMajorCustomer
Namespace Prefix:	bnl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 954
-SubTopic 310
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478785/954-310-50-2

+ Details

Name:	us-gaap_ConcentrationRiskLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration