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Fair Value Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Feb. 23, 2018 | Feb. 24, 2017 | Feb. 26, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Unrealized gain (loss) on investments | $ 0.0 | $ (1.4) | $ (0.2)
Managed Investment Portfolio and Other Investments [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 0.0 | 73.4 |
Unrealized gain (loss) on investments | 0.0 | 0.1 |
Auction Rate Securities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Unrealized gain (loss) on investments | 0.5 |  |
Available-for-sale Securities, Par Value | 6.5 |  |
Other than Temporary Impairment Losses, Investments | 2.5 |  |
Available-for-Sale Securities, Maturities [Abstract] |  |  |
Estimated Reduction in Fair Value due to a One Hundred Basis Point Increase in Discount Rate | 0.4 |  |
Fair Value, Measurements, Recurring [Member] | Auction Rate Securities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Available-for-sale Securities, Fair Value Disclosure | 3.5 | 3.5 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Auction Rate Securities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Available-for-sale Securities, Fair Value Disclosure | $ 3.5 | $ 3.5 | $ 4.4

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- Definition The estimated reduction in the fair value of an investment as a result of a one hundred basis point increase in the discount rate used to calculate the investment's fair value. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=82895926&loc=d3e25351-111560 + Details
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