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Leases - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 option	Sep. 08, 2023 USD ($)
Lessee, Lease, Description [Line Items]
Number of renewal options | option	1
Lease term	10 years
RTS Packaging and Chattanooga Mill
Lessee, Lease, Description [Line Items]
Lease liabilities | $		$ 34,604
Minimum
Lessee, Lease, Description [Line Items]
Lease renewal terms	1 year
Maximum
Lessee, Lease, Description [Line Items]
Lease renewal terms	5 years

X

- Definition

Lessee, Lease, Renewal Term

+ References

No definition available.

+ Details

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- Definition

Lessee, Operating Lease, Number Of Renewal Options

+ References

No definition available.

+ Details

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Namespace Prefix:	son_
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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 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147478964/842-20-50-3

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147478964/842-20-50-3

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479041/842-20-45-1

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- Details

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