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Organization and Summary of Significant Accounting Policies - (Summary of tenants classified as cash basis) (Parenthetical) (Details) - USD ($)	Sep. 30, 2025	Sep. 30, 2024
Accounting Policies [Abstract]
Lease income annualized on base rent	$ 912,218,000	$ 850,976,000

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- Definition

Lease Income Annualized On Base Rent

+ References

No definition available.

+ Details

Name:	nnn_LeaseIncomeAnnualizedOnBaseRent
Namespace Prefix:	nnn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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