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Fair Value Hierarchy of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | Aug. 24, 2018 | Feb. 23, 2018
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | $ 45.7 | $ 283.1
Assets, Fair Value Disclosure [Abstract] |  |
Cash and Cash Equivalents, Fair Value Disclosure | 45.7 | 283.1
Restricted Cash and Cash Equivalents | 3.5 | 2.5
Assets, Fair Value Disclosure | 57.5 | 291.2
Liabilities, Fair Value Disclosure [Abstract] |  |
Foreign exchange forward contracts, Liability, Fair Value Disclosure | (0.4) | (1.4)
Liabilities, Fair Value Disclosure | (0.4) | (1.4)
Foreign Exchange Contract [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 4.5 | 2.1
Auction Rate Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Available-for-sale Securities, Fair Value Disclosure | 3.8 | 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
Restricted Cash and Cash Equivalents |  | 2.5
Assets, Fair Value Disclosure | 49.2 | 285.6
Liabilities, Fair Value Disclosure [Abstract] |  |
Foreign exchange forward 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] | 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 | 4.5 | 2.1
Liabilities, Fair Value Disclosure [Abstract] |  |
Foreign exchange forward contracts, Liability, Fair Value Disclosure | (0.4) | (1.4)
Liabilities, Fair Value Disclosure | (0.4) | (1.4)
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 | 4.5 | 2.1
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 | 3.8 | 3.5
Liabilities, Fair Value Disclosure [Abstract] |  |
Foreign exchange forward 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] | 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 | $ 3.8 | $ 3.5

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