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Summary of Significant Accounting Policies - Narrative (Details) $ in Millions	Jun. 30, 2023 USD ($)
Accounting Policies [Abstract]
Accrued rent	$ 9.4
Accrued rent, write off	0.3
Accrued rent, amount not yet come due	$ 0.6

X

- Definition

Accrued Rent, Amount Accrued, Not Yet Due

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Accrued Rent, Write Offs

+ References

No definition available.

+ Details

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Namespace Prefix:	bfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- References

No definition available.

+ Details

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X

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for contractual rent under lease arrangements.

+ 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(20))
-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(24))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(15)(5))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

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