Income Taxes Carryforwards (Details) (USD $) In Millions, unless otherwise specified	Feb. 22, 2013	Feb. 24, 2012
Operating Loss Carryforwards [Line Items]
Tax effected operating loss carryforwards	$ 85.0	$ 91.4
Tax effected operating loss carryforwards, valuation allowances	(66.5)
Tax effected operating loss carryforwards, net	18.5
Tax credit carryforwards	60.2	20.5
Tax credit carryforward, valuation allowance	0
Tax credit carryforwards, net	60.2
Net operating loss and tax credit carryforwards	78.7
Within One Year [Member]
Operating Loss Carryforwards [Line Items]
Tax effected operating loss carryforwards	0.5
Tax credit carryforwards	0
Between One and Two Years [Member]
Operating Loss Carryforwards [Line Items]
Tax effected operating loss carryforwards	0.4
Tax credit carryforwards	0
Between Two and Three Years [Member]
Operating Loss Carryforwards [Line Items]
Tax effected operating loss carryforwards	1.6
Tax credit carryforwards	0
Between Three and Four Years [Member]
Operating Loss Carryforwards [Line Items]
Tax effected operating loss carryforwards	1.1
Tax credit carryforwards	0
In Five or More Years [Member]
Operating Loss Carryforwards [Line Items]
Tax effected operating loss carryforwards	5.6
Tax credit carryforwards	52.6
No Expiration Date [Member]
Operating Loss Carryforwards [Line Items]
Tax effected operating loss carryforwards	75.8
Tax credit carryforwards	7.6
Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	0
Tax effected operating loss carryforwards	0
Tax effected operating loss carryforwards, valuation allowances	0
Tax effected operating loss carryforwards, net	0
Federal [Member] | Within One Year [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	0
Tax effected operating loss carryforwards	0
Federal [Member] | Between One and Two Years [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	0
Tax effected operating loss carryforwards	0
Federal [Member] | Between Two and Three Years [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	0
Tax effected operating loss carryforwards	0
Federal [Member] | Between Three and Four Years [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	0
Tax effected operating loss carryforwards	0
Federal [Member] | In Five or More Years [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	0
Tax effected operating loss carryforwards	0
Federal [Member] | No Expiration Date [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	0
Tax effected operating loss carryforwards	0
State [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	186.4
Tax effected operating loss carryforwards	5.8
Tax effected operating loss carryforwards, valuation allowances	(0.5)
Tax effected operating loss carryforwards, net	5.3
State [Member] | Within One Year [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	0
Tax effected operating loss carryforwards	0
State [Member] | Between One and Two Years [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	0.3
Tax effected operating loss carryforwards	0
State [Member] | Between Two and Three Years [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	0.1
Tax effected operating loss carryforwards	0
State [Member] | Between Three and Four Years [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	0.1
Tax effected operating loss carryforwards	0
State [Member] | In Five or More Years [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	185.9
Tax effected operating loss carryforwards	4.8
State [Member] | No Expiration Date [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	0
Tax effected operating loss carryforwards	1.0
International [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	252.8
Tax effected operating loss carryforwards	79.2
Tax effected operating loss carryforwards, valuation allowances	(66.0)
Tax effected operating loss carryforwards, net	13.2
International [Member] | Within One Year [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	1.8
Tax effected operating loss carryforwards	0.5
International [Member] | Between One and Two Years [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	1.4
Tax effected operating loss carryforwards	0.4
International [Member] | Between Two and Three Years [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	5.4
Tax effected operating loss carryforwards	1.6
International [Member] | Between Three and Four Years [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	3.8
Tax effected operating loss carryforwards	1.1
International [Member] | In Five or More Years [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	3.7
Tax effected operating loss carryforwards	0.8
International [Member] | No Expiration Date [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	236.7
Tax effected operating loss carryforwards	$ 74.8