Number of persons employed by the Entity

No definition available.

Name:	dei_EntityNumberOfEmployees
Namespace Prefix:	dei_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Line of Credit Facility, Number of Syndicated Banks

+ References

No definition available.

+ Details

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Namespace Prefix:	son_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

- Definition

The number of businesses acquired by the entity during the period.

+ References

No definition available.

+ Details

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

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

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+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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Namespace Prefix:
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Balance Type:
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- Details

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Namespace Prefix:
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Balance Type:
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- Details

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Subsequent Events - Additional Information (Details) $ in Thousands	Jan. 26, 2022 USD ($) employee facility	Jan. 21, 2022 USD ($) bank	Dec. 19, 2021 USD ($)	Jun. 30, 2021
LIBOR
Subsequent Event [Line Items]
Basis points (percent)				1.25%
Ball Metalpack
Subsequent Event [Line Items]
Acquisition cost of entity			$ 1,350,000
Ball Metalpack \| Subsequent event
Subsequent Event [Line Items]
Acquisition cost of entity	$ 1,350,000
Number of employees \| employee	1,300
Number of acquisitions \| facility	8
Ball Metalpack \| Subsequent event \| LIBOR
Subsequent Event [Line Items]
Basis points (percent)		1.225%
Eight Banks Syndicate \| Ball Metalpack \| Subsequent event
Subsequent Event [Line Items]
Number of banks syndicated \| bank		8
Unsecured Debt \| Subsequent event
Subsequent Event [Line Items]
Debt principal		$ 1,200,000
Unsecured Debt \| Ball Metalpack \| Subsequent event
Subsequent Event [Line Items]
Debt term		3 years
2027 Notes \| Unsecured Debt \| Subsequent event
Subsequent Event [Line Items]
Debt principal		$ 300,000
Amounts drawn		$ 300,000