Line items represent reporting 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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 12
-Sentence Column A

+ Details

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Namespace Prefix:	invest_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

This item represents investment income derived from investments in variable and whole life company owned life insurance policies.

+ References

No definition available.

+ Details

Name:	scs_ColiIncome
Namespace Prefix:	scs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 4
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6812-107765

+ Details

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

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_OperatingExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=scs_WholeLifeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_VariableLifeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Company-Owned Life Insurance (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 22, 2019	Feb. 23, 2018	Feb. 24, 2017
Investment [Line Items]
Company-owned life insurance (COLI)	$ 156.1	$ 172.2
Operating Expense [Member]
Investment [Line Items]
COLI Investment Income	7.5	10.3	$ 9.5
Whole Life [Member]
Investment [Line Items]
Company-owned life insurance (COLI)	108.6	124.3
Variable Life [Member]
Investment [Line Items]
Company-owned life insurance (COLI)	$ 47.5	$ 47.9