Fair Value Hierarchy of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | May. 29, 2015 | Feb. 27, 2015 |
Assets, Fair Value Disclosure [Abstract] | | |
Restricted Cash and Cash Equivalents | $ 2.5 | $ 2.5 |
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | | |
Assets, Fair Value Disclosure [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 5.2 | 7.7 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Assets, Fair Value Disclosure [Abstract] | | |
Cash and Cash Equivalents, Fair Value Disclosure | 110.5 | 176.5 |
Foreign Currency Contract, Asset, Fair Value Disclosure | 0 | 0 |
Assets, Fair Value Disclosure | 118.2 | 183.3 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Foreign Currency Contracts, Liability, Fair Value Disclosure | 0 | 0 |
Liabilities, Fair Value Disclosure | 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] | 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] | US Government-sponsored Enterprises Debt Securities [Member] | | |
Assets, Fair Value Disclosure [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 5.2 | 4.3 |
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] | Other Debt Obligations [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] | Canadian Asset Backed Commercial Paper Restructuring Notes [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] | 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 |
Foreign Currency Contract, Asset, Fair Value Disclosure | 1.6 | 24.1 |
Assets, Fair Value Disclosure | 45.2 | 91.5 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Foreign Currency Contracts, Liability, Fair Value Disclosure | (4.6) | (3.1) |
Liabilities, Fair Value Disclosure | (4.6) | (3.1) |
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 | 16.8 | 30.7 |
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 | 17.3 | 24.1 |
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 | 5.2 | 7.7 |
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] | Municipal Bonds [Member] | | |
Assets, Fair Value Disclosure [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0.3 | 0.8 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Debt Obligations [Member] | | |
Assets, Fair Value Disclosure [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0.7 | 0.7 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Canadian Asset Backed Commercial Paper Restructuring Notes [Member] | | |
Assets, Fair Value Disclosure [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 3.3 | 3.4 |
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] | Estimate of Fair Value, Fair Value Disclosure [Member] | | |
Assets, Fair Value Disclosure [Abstract] | | |
Cash and Cash Equivalents, Fair Value Disclosure | 110.5 | 176.5 |
Restricted Cash and Cash Equivalents | 2.5 | 2.5 |
Foreign Currency Contract, Asset, Fair Value Disclosure | 1.6 | 24.1 |
Assets, Fair Value Disclosure | 173.1 | 284.5 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Foreign Currency Contracts, Liability, Fair Value Disclosure | (4.6) | (3.1) |
Liabilities, Fair Value Disclosure | (4.6) | (3.1) |
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Corporate Debt Securities [Member] | | |
Assets, Fair Value Disclosure [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 16.8 | 30.7 |
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | US Government Agencies Debt Securities [Member] | | |
Assets, Fair Value Disclosure [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 17.3 | 24.1 |
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | US Government-sponsored Enterprises Debt Securities [Member] | | |
Assets, Fair Value Disclosure [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 5.2 | 4.3 |
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal Bonds [Member] | | |
Assets, Fair Value Disclosure [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0.3 | 0.8 |
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Other Debt Obligations [Member] | | |
Assets, Fair Value Disclosure [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 0.7 | 0.7 |
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Canadian Asset Backed Commercial Paper Restructuring Notes [Member] | | |
Assets, Fair Value Disclosure [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 3.3 | 3.4 |
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Auction Rate Securities [Member] | | |
Assets, Fair Value Disclosure [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | 9.7 | 9.7 |
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 |
Foreign Currency Contract, Asset, Fair Value Disclosure | 0 | 0 |
Assets, Fair Value Disclosure | 9.7 | 9.7 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Foreign Currency Contracts, Liability, Fair Value Disclosure | 0 | 0 |
Liabilities, Fair Value Disclosure | 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] | 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] | 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] | 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] | Other Debt Obligations [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] | Canadian Asset Backed Commercial Paper Restructuring Notes [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] | Auction Rate Securities [Member] | | |
Assets, Fair Value Disclosure [Abstract] | | |
Available-for-sale Securities, Fair Value Disclosure | $ 9.7 | $ 9.7 |