Fair Value Hierarchy of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions | Aug. 28, 2015 | May. 29, 2015 | Feb. 27, 2015 |
Asset-backed Securities [Member] | | | |
Assets, Fair Value Disclosure [Abstract] | | | |
Available-for-sale Securities, Fair Value Disclosure | $ 6 | | $ 7.7 |
Estimate of Fair Value, Fair Value Disclosure [Member] | | | |
Assets, Fair Value Disclosure [Abstract] | | | |
Cash and Cash Equivalents, Fair Value Disclosure | 161.4 | | 176.5 |
Restricted Cash and Cash Equivalents | 2.5 | | 2.5 |
Foreign exchange forward contract, Asset, Fair Value Disclosure | 1.2 | | 24.1 |
Assets, Fair Value Disclosure | 223.7 | | 284.5 |
Liabilities, Fair Value Disclosure [Abstract] | | | |
Foreign exchange forward contracts, Liability, Fair Value Disclosure | (6) | | (3.1) |
Liabilities, Fair Value Disclosure | (6) | | (3.1) |
Estimate of Fair Value, Fair Value Disclosure [Member] | Corporate Debt Securities [Member] | | | |
Assets, Fair Value Disclosure [Abstract] | | | |
Available-for-sale Securities, Fair Value Disclosure | 17 | | 30.7 |
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 | | 24.1 |
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 | 5.5 | | 4.3 |
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 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Other Debt Obligations [Member] | | | |
Assets, Fair Value Disclosure [Abstract] | | | |
Available-for-sale Securities, Fair Value Disclosure | | $ 0.1 | 0.7 |
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 | 3.1 | | 3.4 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Auction Rate Securities [Member] | | | |
Assets, Fair Value Disclosure [Abstract] | | | |
Available-for-sale Securities, Fair Value Disclosure | 9.6 | | 9.7 |
Fair Value, Inputs, Level 1 [Member] | | | |
Assets, Fair Value Disclosure [Abstract] | | | |
Cash and Cash Equivalents, Fair Value Disclosure | 161.4 | | 176.5 |
Restricted Cash and Cash Equivalents | 2.5 | | 2.5 |
Foreign exchange forward contract, Asset, Fair Value Disclosure | 0 | | 0 |
Assets, Fair Value Disclosure | 169.4 | | 183.3 |
Liabilities, Fair Value Disclosure [Abstract] | | | |
Foreign exchange forward contracts, Liability, Fair Value Disclosure | 0 | | 0 |
Liabilities, Fair Value Disclosure | 0 | | 0 |
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, 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, Inputs, Level 1 [Member] | Asset-backed Securities [Member] | | | |
Assets, Fair Value Disclosure [Abstract] | | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | | 0 |
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 | 5.5 | | 4.3 |
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, Inputs, Level 1 [Member] | Other Debt Obligations [Member] | | | |
Assets, Fair Value Disclosure [Abstract] | | | |
Available-for-sale Securities, Fair Value Disclosure | | 0 | 0 |
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, Inputs, Level 1 [Member] | Auction Rate Securities [Member] | | | |
Assets, Fair Value Disclosure [Abstract] | | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | | 0 |
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 exchange forward contract, Asset, Fair Value Disclosure | 1.2 | | 24.1 |
Assets, Fair Value Disclosure | 44.7 | | 91.5 |
Liabilities, Fair Value Disclosure [Abstract] | | | |
Foreign exchange forward contracts, Liability, Fair Value Disclosure | (6) | | (3.1) |
Liabilities, Fair Value Disclosure | (6) | | (3.1) |
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] | | | |
Assets, Fair Value Disclosure [Abstract] | | | |
Available-for-sale Securities, Fair Value Disclosure | 17 | | 30.7 |
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 | | 24.1 |
Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities [Member] | | | |
Assets, Fair Value Disclosure [Abstract] | | | |
Available-for-sale Securities, Fair Value Disclosure | 6 | | 7.7 |
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, 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, Inputs, Level 2 [Member] | Other Debt Obligations [Member] | | | |
Assets, Fair Value Disclosure [Abstract] | | | |
Available-for-sale Securities, Fair Value Disclosure | | 0.1 | 0.7 |
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 | 3.1 | | 3.4 |
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, 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 exchange forward contract, Asset, Fair Value Disclosure | 0 | | 0 |
Assets, Fair Value Disclosure | 9.6 | | 9.7 |
Liabilities, Fair Value Disclosure [Abstract] | | | |
Foreign exchange forward contracts, Liability, Fair Value Disclosure | 0 | | 0 |
Liabilities, Fair Value Disclosure | 0 | | 0 |
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, 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, Inputs, Level 3 [Member] | Asset-backed Securities [Member] | | | |
Assets, Fair Value Disclosure [Abstract] | | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | | 0 |
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, Inputs, Level 3 [Member] | Municipal Bonds [Member] | | | |
Assets, Fair Value Disclosure [Abstract] | | | |
Available-for-sale Securities, Fair Value Disclosure | 0 | | 0 |
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, 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, Inputs, Level 3 [Member] | Auction Rate Securities [Member] | | | |
Assets, Fair Value Disclosure [Abstract] | | | |
Available-for-sale Securities, Fair Value Disclosure | $ 9.6 | | $ 9.7 |