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Segment reporting - Additional Information (Details)	4 Months Ended	12 Months Ended
	Apr. 04, 2021 transaction	Dec. 31, 2021 segment
Segment Reporting [Abstract]
Number of reportable segments (segment) | segment		2
Number of separate transactions | transaction	2

X

- Definition

Number Of Divestitive Transactions

+ References

No definition available.

+ Details

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Namespace Prefix:	son_
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Balance Type:	na
Period Type:	duration

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8672-108599

+ Details

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Balance Type:	na
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- References

No definition available.

+ Details

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