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v3.21.1

Company-Owned Life Insurance (Details) - USD ($) $ in Millions | 12 Months Ended
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Feb. 26, 2021 | Feb. 28, 2020 | Feb. 22, 2019
Company Owned Life Insurance [Line Items] |  |  |
Company-owned life insurance ("COLI") | $ 169.5 | $ 160.0 |
Operating Expense [Member] |  |  |
Company Owned Life Insurance [Line Items] |  |  |
COLI Investment Income | 12.3 | 6.6 | $ 7.5
Whole Life [Member] |  |  |
Company Owned Life Insurance [Line Items] |  |  |
Company-owned life insurance ("COLI") | 111.3 | 110.3 |
Variable Life [Member] |  |  |
Company Owned Life Insurance [Line Items] |  |  |
Company-owned life insurance ("COLI") | $ 58.2 | $ 49.7 |

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- 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

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- Definition [Line Items] for Company Owned Life Insurance [Table] + References No definition available. + Details
Name: | scs_CompanyOwnedLifeInsuranceLineItems
Namespace Prefix: | scs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6812-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
Name: | us-gaap_CashSurrenderValueOfLifeInsurance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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