Number of Small Tube And Core Plants

No definition available.

Name:	son_NumberOfSmallTubeAndCorePlants
Namespace Prefix:	son_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Restructuring and Related Cost, Number of Facilities Closed

+ References

No definition available.

+ Details

Name:	son_RestructuringAndRelatedCostNumberOfFacilitiesClosed
Namespace Prefix:	son_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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

- Definition

The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-2

+ Details

Name:	us-gaap_OtherAssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of expected cost remaining for the specified restructuring cost.

+ References

No definition available.

+ Details

Name:	us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The number of positions eliminated as of the balance sheet date since inception of the restructuring plan(s).

+ References

No definition available.

+ Details

Name:	us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminatedInceptionToDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_ReclassificationTypeAxis=srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=son_IndustrialPaperPackagingSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=son_OrganizationalEffectivenessEffortsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Restructuring and asset impairment - Additional Information (Details) $ in Thousands		12 Months Ended
	Jul. 01, 2022 USD ($)	Dec. 31, 2024 USD ($) facility employee	Dec. 31, 2023 USD ($) position	Dec. 31, 2022 USD ($) manufacturing_plant
Disposal Group, Including Discontinued Operations [Line Items]
Future additional charges expected to be recognized		$ 3,000
Other asset impairments		$ 0	$ 0	$ 10,095
Impact of new accounting pronouncements
Disposal Group, Including Discontinued Operations [Line Items]
Other asset impairments	$ 3,747
Industrial Paper Packaging
Disposal Group, Including Discontinued Operations [Line Items]
Number of small tube and core plants \| manufacturing_plant				2
Organizational Effectiveness Efforts
Disposal Group, Including Discontinued Operations [Line Items]
Elimination of positions due to realignment of cost structure (position)		300	200
Number of facilities closed \| facility		2