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Fair Value Hierarchy of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | Feb. 23, 2018 | Feb. 24, 2017 | Feb. 26, 2016
--- | --- | --- | ---
Assets, Fair Value Disclosure [Abstract] |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | $ 2.1 | $ 3.5 |
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Foreign Currency Contracts, Liability, Fair Value Disclosure | (1.4) | (0.9) |
Fair Value, Measurements, Recurring [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 283.1 | 197.1 |
Restricted Cash and Cash Equivalents | 2.5 | 2.5 |
Assets, Fair Value Disclosure | 291.2 | 280.0 |
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Foreign Currency Contracts, Liability, Fair Value Disclosure | (1.4) | (0.9) |
Liabilities, Fair Value Disclosure | 1.4 | 0.9 |
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 33.6 |
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 18.6 |
Fair Value, Measurements, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 2.4 |
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 3.7 |
Fair Value, Measurements, Recurring [Member] | Municipal Bonds [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 15.1 |
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contract [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 2.1 | 3.5 |
Fair Value, Measurements, Recurring [Member] | Auction Rate Securities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available-for-sale Securities, Fair Value Disclosure | 3.5 | 3.5 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 283.1 | 197.1 |
Restricted Cash and Cash Equivalents | 2.5 | 2.5 |
Assets, Fair Value Disclosure | 285.6 | 202.0 |
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Foreign Currency Contracts, Liability, Fair Value Disclosure | 0.0 | 0.0 |
Liabilities, Fair Value Disclosure | 0.0 | 0.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 0.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Government Agencies Debt Securities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 0.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 2.4 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Asset-backed Securities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 0.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Municipal Bonds [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 0.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Contract [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 0.0 | 0.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Auction Rate Securities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available-for-sale Securities, Fair Value Disclosure | 0.0 | 0.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 0.0 | 0.0 |
Restricted Cash and Cash Equivalents | 0.0 | 0.0 |
Assets, Fair Value Disclosure | 2.1 | 74.5 |
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Foreign Currency Contracts, Liability, Fair Value Disclosure | (1.4) | (0.9) |
Liabilities, Fair Value Disclosure | 1.4 | 0.9 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 33.6 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 18.6 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 0.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 3.7 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 15.1 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 2.1 | 3.5 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Auction Rate Securities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available-for-sale Securities, Fair Value Disclosure | 0.0 | 0.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 0.0 | 0.0 |
Restricted Cash and Cash Equivalents | 0.0 | 0.0 |
Assets, Fair Value Disclosure | 3.5 | 3.5 |
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Foreign Currency Contracts, Liability, Fair Value Disclosure | 0.0 | 0.0 |
Liabilities, Fair Value Disclosure | 0.0 | 0.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 0.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Government Agencies Debt Securities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 0.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 0.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 0.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Municipal Bonds [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 0.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Contract [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 0.0 | 0.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Auction Rate Securities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available-for-sale Securities, Fair Value Disclosure | $ 3.5 | $ 3.5 | $ 4.4

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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 Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 5: 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(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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