Fair Value Hierarchy of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified	Nov. 22, 2013 Fair Value, Inputs, Level 1 [Member]	Feb. 22, 2013 Fair Value, Inputs, Level 1 [Member]	Nov. 22, 2013 Fair Value, Inputs, Level 1 [Member] US Government Agencies Debt Securities [Member]	Feb. 22, 2013 Fair Value, Inputs, Level 1 [Member] US Government Agencies Debt Securities [Member]	Nov. 22, 2013 Fair Value, Inputs, Level 1 [Member] Corporate Debt Securities [Member]	Feb. 22, 2013 Fair Value, Inputs, Level 1 [Member] Corporate Debt Securities [Member]	Nov. 22, 2013 Fair Value, Inputs, Level 1 [Member] US Government-sponsored Enterprises Debt Securities [Member]	Feb. 22, 2013 Fair Value, Inputs, Level 1 [Member] US Government-sponsored Enterprises Debt Securities [Member]	Nov. 22, 2013 Fair Value, Inputs, Level 1 [Member] Asset-backed Securities [Member]	Feb. 22, 2013 Fair Value, Inputs, Level 1 [Member] Asset-backed Securities [Member]	Feb. 28, 2014 Fair Value, Inputs, Level 1 [Member] Municipal Bonds [Member]	Feb. 22, 2013 Fair Value, Inputs, Level 1 [Member] Municipal Bonds [Member]	Nov. 22, 2013 Fair Value, Inputs, Level 1 [Member] Other Debt Obligations [Member]	Feb. 22, 2013 Fair Value, Inputs, Level 1 [Member] Other Debt Obligations [Member]	Nov. 22, 2013 Fair Value, Inputs, Level 1 [Member] Auction Rate Securities [Member]	Feb. 22, 2013 Fair Value, Inputs, Level 1 [Member] Auction Rate Securities [Member]	Nov. 22, 2013 Fair Value, Inputs, Level 1 [Member] Canadian Asset Backed Commercial Paper Restructuring Notes [Member]	Feb. 22, 2013 Fair Value, Inputs, Level 1 [Member] Canadian Asset Backed Commercial Paper Restructuring Notes [Member]	Nov. 22, 2013 Fair Value, Inputs, Level 2 [Member]	Feb. 22, 2013 Fair Value, Inputs, Level 2 [Member]	Nov. 22, 2013 Fair Value, Inputs, Level 2 [Member] US Government Agencies Debt Securities [Member]	Feb. 22, 2013 Fair Value, Inputs, Level 2 [Member] US Government Agencies Debt Securities [Member]	Nov. 22, 2013 Fair Value, Inputs, Level 2 [Member] Corporate Debt Securities [Member]	Feb. 22, 2013 Fair Value, Inputs, Level 2 [Member] Corporate Debt Securities [Member]	Nov. 22, 2013 Fair Value, Inputs, Level 2 [Member] US Government-sponsored Enterprises Debt Securities [Member]	Feb. 22, 2013 Fair Value, Inputs, Level 2 [Member] US Government-sponsored Enterprises Debt Securities [Member]	Nov. 22, 2013 Fair Value, Inputs, Level 2 [Member] Asset-backed Securities [Member]	Feb. 22, 2013 Fair Value, Inputs, Level 2 [Member] Asset-backed Securities [Member]	Feb. 28, 2014 Fair Value, Inputs, Level 2 [Member] Municipal Bonds [Member]	Feb. 22, 2013 Fair Value, Inputs, Level 2 [Member] Municipal Bonds [Member]	Nov. 22, 2013 Fair Value, Inputs, Level 2 [Member] Other Debt Obligations [Member]	Feb. 22, 2013 Fair Value, Inputs, Level 2 [Member] Other Debt Obligations [Member]	Nov. 22, 2013 Fair Value, Inputs, Level 2 [Member] Auction Rate Securities [Member]	Feb. 22, 2013 Fair Value, Inputs, Level 2 [Member] Auction Rate Securities [Member]	Nov. 22, 2013 Fair Value, Inputs, Level 2 [Member] Canadian Asset Backed Commercial Paper Restructuring Notes [Member]	Feb. 22, 2013 Fair Value, Inputs, Level 2 [Member] Canadian Asset Backed Commercial Paper Restructuring Notes [Member]	Nov. 22, 2013 Fair Value, Inputs, Level 3 [Member]	Feb. 22, 2013 Fair Value, Inputs, Level 3 [Member]	Nov. 22, 2013 Fair Value, Inputs, Level 3 [Member] US Government Agencies Debt Securities [Member]	Feb. 22, 2013 Fair Value, Inputs, Level 3 [Member] US Government Agencies Debt Securities [Member]	Nov. 22, 2013 Fair Value, Inputs, Level 3 [Member] Corporate Debt Securities [Member]	Feb. 22, 2013 Fair Value, Inputs, Level 3 [Member] Corporate Debt Securities [Member]	Nov. 22, 2013 Fair Value, Inputs, Level 3 [Member] US Government-sponsored Enterprises Debt Securities [Member]	Feb. 22, 2013 Fair Value, Inputs, Level 3 [Member] US Government-sponsored Enterprises Debt Securities [Member]	Nov. 22, 2013 Fair Value, Inputs, Level 3 [Member] Asset-backed Securities [Member]	Feb. 22, 2013 Fair Value, Inputs, Level 3 [Member] Asset-backed Securities [Member]	Feb. 28, 2014 Fair Value, Inputs, Level 3 [Member] Municipal Bonds [Member]	Feb. 22, 2013 Fair Value, Inputs, Level 3 [Member] Municipal Bonds [Member]	Nov. 22, 2013 Fair Value, Inputs, Level 3 [Member] Other Debt Obligations [Member]	Feb. 22, 2013 Fair Value, Inputs, Level 3 [Member] Other Debt Obligations [Member]	Nov. 22, 2013 Fair Value, Inputs, Level 3 [Member] Auction Rate Securities [Member]	Feb. 22, 2013 Fair Value, Inputs, Level 3 [Member] Auction Rate Securities [Member]	Nov. 22, 2013 Fair Value, Inputs, Level 3 [Member] Canadian Asset Backed Commercial Paper Restructuring Notes [Member]	Feb. 22, 2013 Fair Value, Inputs, Level 3 [Member] Canadian Asset Backed Commercial Paper Restructuring Notes [Member]	Nov. 22, 2013 Estimate of Fair Value, Fair Value Disclosure [Member]	Feb. 22, 2013 Estimate of Fair Value, Fair Value Disclosure [Member]	Nov. 22, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] US Government Agencies Debt Securities [Member]	Feb. 22, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] US Government Agencies Debt Securities [Member]	Nov. 22, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Corporate Debt Securities [Member]	Feb. 22, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Corporate Debt Securities [Member]	Nov. 22, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] US Government-sponsored Enterprises Debt Securities [Member]	Feb. 22, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] US Government-sponsored Enterprises Debt Securities [Member]	Nov. 22, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Asset-backed Securities [Member]	Feb. 22, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Asset-backed Securities [Member]	Nov. 22, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Municipal Bonds [Member]	Feb. 22, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Municipal Bonds [Member]	Nov. 22, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Other Debt Obligations [Member]	Feb. 22, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Other Debt Obligations [Member]	Nov. 22, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Auction Rate Securities [Member]	Feb. 22, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Auction Rate Securities [Member]	Nov. 22, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Canadian Asset Backed Commercial Paper Restructuring Notes [Member]	Feb. 22, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Canadian Asset Backed Commercial Paper Restructuring Notes [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	$ 149.1	$ 150.4																	$ 0	$ 0																	$ 0	$ 0																	$ 149.1	$ 150.4
Restricted Cash and Cash Equivalents	3.5	3.5																	0	0																	0	0																	3.5	3.5
Available-for-sale Securities, Fair Value Disclosure			0	0	0	0	6.1	4.4	0	0	0	0	0	0	0	0	0	0			54.1	44.1	71.6	30.3	0	0	5.7	5.5	3.5	14.1	6.9	2.1	0	0	0	0			0	0	0	0	0	0	0	0	0	0	0	0	9.9	9.8	3.8	3.5			54.1	44.1	71.6	30.3	6.1	4.4	5.7	5.5	3.5	14.1	6.9	2.1	9.9	9.8	3.8	3.5
Foreign Currency Contract, Asset, Fair Value Disclosure	0	0																	0.6	1.3																	0	0																	0.6	1.3
Assets, Fair Value Disclosure	158.7	158.3																	142.4	97.4																	13.7	13.3																	314.8	269.0
Liabilities, Fair Value Disclosure [Abstract]
Foreign Currency Contracts, Liability, Fair Value Disclosure	0	0																	(1.9)	(1.9)																	0	0																	(1.9)	(1.9)
Liabilities, Fair Value Disclosure	$ 0	$ 0																	$ (1.9)	$ (1.9)																	$ 0	$ 0																	$ (1.9)	$ (1.9)