Fair Value Hierarchy of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | May 25, 2018 | Feb. 23, 2018 |
Assets, Fair Value Disclosure [Abstract] | | |
Cash and Cash Equivalents, Fair Value Disclosure | $ 134.9 | $ 283.1 |
Restricted Cash and Cash Equivalents | 3.4 | 2.5 |
Assets, Fair Value Disclosure | 144.3 | 291.2 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Foreign exchange forward contracts, Liability, Fair Value Disclosure | (0.6) | (1.4) |
Liabilities, Fair Value Disclosure | (0.6) | (1.4) |
Foreign Exchange Contract [Member] | | |
Assets, Fair Value Disclosure [Abstract] | | |
Foreign Currency Contract, Asset, Fair Value Disclosure | 2.4 | 2.1 |
Auction Rate Securities [Member] | | |
Assets, Fair Value Disclosure [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 3.6 | 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 | 134.9 | 283.1 |
Restricted Cash and Cash Equivalents | 3.4 | 2.5 |
Assets, Fair Value Disclosure | 138.3 | 285.6 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Foreign exchange forward contracts, Liability, Fair Value Disclosure | 0 | 0 |
Liabilities, 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 |
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 |
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 |
Restricted Cash and Cash Equivalents | 0 | 0 |
Assets, Fair Value Disclosure | 2.4 | 2.1 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Foreign exchange forward contracts, Liability, Fair Value Disclosure | (0.6) | (1.4) |
Liabilities, Fair Value Disclosure | (0.6) | (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 | 2.4 | 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 |
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 |
Restricted Cash and Cash Equivalents | 0 | 0 |
Assets, Fair Value Disclosure | 3.6 | 3.5 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Foreign exchange forward contracts, Liability, Fair Value Disclosure | 0 | 0 |
Liabilities, 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 |
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 | $ 3.6 | $ 3.5 |