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Fair Value Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Feb. 28, 2020 | Feb. 22, 2019 | Feb. 23, 2018 | May 24, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Unrealized gain (loss) on investments | $ (0.1) | $ 0.4 | $ 0.0 |
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 |  | $ 0.0
Unrealized gain (loss) on investments | 0.0 |  |  |
Auction Rate Securities [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Unrealized gain (loss) on investments | 0.2 |  |  |
Available-for-sale Securities, Par Value | 3.2 |  |  |
Other than Temporary Impairment Losses, Investments | 0.9 |  |  |
Available-for-Sale Securities, Maturities [Abstract] |  |  |  |
Estimated Reduction in Fair Value due to a One Hundred Basis Point Increase in Discount Rate | 0.3 |  |  |
Fair Value, Recurring [Member] | Auction Rate Securities [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | 2.1 | 3.9 |  |
Fair Value, 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 | $ 2.1 | $ 3.9 | $ 3.5 |

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- Definition The face amount of the securities; generally not indicative of the fair market value. + References No definition available. + Details
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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 This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=118954083&loc=SL6284422-111562 + Details
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