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Company-Owned Life Insurance (Details) - USD ($) $ in Millions | 12 Months Ended
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Feb. 23, 2018 | Feb. 24, 2017 | Feb. 26, 2016
Investment [Line Items] |  |  |
Company-owned life insurance (COLI) | $ 172.2 | $ 168.8 |
Operating Expense [Member] |  |  |
Investment [Line Items] |  |  |
COLI Investment Income | 10.3 | 9.5 | $ 0.8
Whole Life [Member] |  |  |
Investment [Line Items] |  |  |
Company-owned life insurance (COLI) | 124.3 | 125.6 |
Variable Life [Member] |  |  |
Investment [Line Items] |  |  |
Company-owned life insurance (COLI) | $ 47.9 | $ 43.2 |

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- Definition 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. + References 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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- Definition This item represents investment income derived from investments in variable and whole life company owned life insurance policies. + References No definition available. + Details
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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://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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