Limited Partners' Capital Account, Convertible Units, Conversion Ratio

No definition available.

Name:	bfs_LimitedPartnersCapitalAccountConvertibleUnitsConversionRatio
Namespace Prefix:	bfs_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Limited Partners' Capital Account, Convertible Units, Eligible for Conversion

+ References

No definition available.

+ Details

Name:	bfs_LimitedPartnersCapitalAccountConvertibleUnitsEligibleForConversion
Namespace Prefix:	bfs_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Minimum Outstanding Stock Percentage That Should be Acquired for Rights Issued to Become Exercisable

+ References

No definition available.

+ Details

Name:	bfs_MinimumOutstandingStockPercentageThatShouldBeAcquiredForRightsIssuedToBecomeExercisable
Namespace Prefix:	bfs_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Partners' Capital Account, Units, Converted and Weighted Average Shares Outstanding, Diluted

+ References

No definition available.

+ Details

Name:	bfs_PartnersCapitalAccountUnitsConvertedAndWeightedAverageSharesOutstandingDiluted
Namespace Prefix:	bfs_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of limited partner units outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 4.F)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-5

+ Details

Name:	us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- 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

No definition available.

+ Details

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

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of shares of stock issued during the period pursuant to acquisitions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesAcquisitions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_BusinessAcquisitionAxis=bfs_LeaseholdInterestContributedInContributionAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=bfs_SaulHoldingsLimitedPartnershipMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=bfs_OperatingPartnershipHeldByNoncontrollingInterestMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Noncontrolling Interests - Holders of Convertible Limited Partnership Units in the Operating Partnership (Details) - shares	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Noncontrolling Interest [Line Items]
Limited partnership units (in shares)	10,100,000
Limited partnership units, conversion ratio	1
Outstanding stock percent that should be acquired for rights to be exercised (as a percent)	39.90%
Limited partnership units convertible into shares of common stock, eligible for conversion (in shares)	727,000
Fully converted partnership units and diluted weighted average shares outstanding		34,700,000	34,400,000
Leasehold Interest Contributed In Contribution Agreement
Noncontrolling Interest [Line Items]
Number of partnership units issued in transaction (in shares)	469,740
Saul Holdings Limited Partnership
Noncontrolling Interest [Line Items]
Percentage of ownership interest of noncontrolling interest (as a percent)	29.00%
Limited partnership units, conversion ratio	1
Saul Holdings Limited Partnership \| Leasehold Interest Contributed In Contribution Agreement
Noncontrolling Interest [Line Items]
Percentage of ownership interest of noncontrolling interest (as a percent)	1.40%
Operating Partnership Held By Noncontrolling Interest
Noncontrolling Interest [Line Items]
Percentage of ownership interest of noncontrolling interest (as a percent)	30.40%