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Income Taxes Carryforwards (Details) - USD ($) $ in Millions	Feb. 23, 2018	Feb. 24, 2017	Feb. 26, 2016	Feb. 27, 2015
Operating Loss Carryforwards [Line Items]
Liability for Uncertain Tax Positions presented net in underlying deferred tax asset	$ 2.2
Tax effected operating loss carryforwards	55.8	$ 57.0
Tax effected operating loss carryforwards, valuation allowances	(7.8)
Deferred Tax Assets, Operating Loss Carryforwards net of federal tax benefit on State Losses	55.8
Tax effected operating loss carryforwards, net	48.0
Tax credit carryforwards	31.8	17.4
Tax credit carryforward, valuation allowance	(1.7)
Tax credit carryforwards, net	30.1
Net operating loss and tax credit carryforwards	78.1
Unrecognized Tax Benefits	2.2	$ 2.8	$ 8.6	$ 8.8
Within One Year [Member]
Operating Loss Carryforwards [Line Items]
Tax effected operating loss carryforwards	0.6
Tax credit carryforwards	0.0
In Five or More Years [Member]
Operating Loss Carryforwards [Line Items]
Tax effected operating loss carryforwards	1.9
Tax credit carryforwards	31.8
No Expiration Date [Member]
Operating Loss Carryforwards [Line Items]
Tax effected operating loss carryforwards	53.3
Tax credit carryforwards	0.0
Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	0.0
Tax effected operating loss carryforwards	0.0
Tax effected operating loss carryforwards, valuation allowances	0.0
Tax effected operating loss carryforwards, net	0.0
Federal [Member] | Within One Year [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	0.0
Tax effected operating loss carryforwards	0.0
Federal [Member] | In Five or More Years [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	0.0
Tax effected operating loss carryforwards	0.0
Federal [Member] | No Expiration Date [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	0.0
Tax effected operating loss carryforwards	0.0
State [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	17.0
Tax effected operating loss carryforwards, valuation allowances	(0.5)
Deferred Tax Assets, Operating Loss Carryforwards net of federal tax benefit on State Losses	1.9
Tax effected operating loss carryforwards, net	1.4
State [Member] | Within One Year [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	0.0
Tax effected operating loss carryforwards	0.0
State [Member] | In Five or More Years [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	17.0
Tax effected operating loss carryforwards	1.9
State [Member] | No Expiration Date [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	0.0
Tax effected operating loss carryforwards	0.0
International [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	219.7
Tax effected operating loss carryforwards	53.9
Tax effected operating loss carryforwards, valuation allowances	(7.3)
Tax effected operating loss carryforwards, net	46.6
International [Member] | Within One Year [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	2.0
Tax effected operating loss carryforwards	0.6
International [Member] | In Five or More Years [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	0.0
Tax effected operating loss carryforwards	0.0
International [Member] | No Expiration Date [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	217.7
Tax effected operating loss carryforwards	$ 53.3

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- Definition

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible operating loss and tax credit carryforwards.

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The cumulative amount after valuation allowances of future tax effects arising from the unused tax credit carryforward that cannot be utilized on the tax return during a year that may be carried forward to reduce taxable income or taxes payable in a future year; a tax credit carryforward is the amount by which tax credits available for utilization exceed statutory limitations.

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Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards.

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The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized.

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