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Income Taxes Carryforwards (Details) - USD ($) $ in Millions	Feb. 22, 2019	Feb. 23, 2018	Feb. 24, 2017	Feb. 26, 2016
Operating Loss Carryforwards [Line Items]
Liability for Uncertain Tax Positions presented net in underlying deferred tax asset	$ 2.0	$ 2.2
Tax effected operating loss carryforwards	46.1	55.8
Tax effected operating loss carryforwards, valuation allowances	(6.4)
Deferred Tax Assets, Operating Loss Carryforwards net of federal tax benefit on State Losses	46.5
Tax effected operating loss carryforwards, net	40.1
Tax credit carryforwards	38.7	31.8
Tax credit carryforward, valuation allowance	(1.5)
Tax credit carryforwards, net	37.2
Net operating loss and tax credit carryforwards	77.3
Unrecognized Tax Benefits	2.0	$ 2.2	$ 2.8	$ 8.6
Within One Year [Member]
Operating Loss Carryforwards [Line Items]
Tax effected operating loss carryforwards	0.1
Tax credit carryforwards	0.0
In Five or More Years [Member]
Operating Loss Carryforwards [Line Items]
Tax effected operating loss carryforwards	1.8
Tax credit carryforwards	38.7
No Expiration Date [Member]
Operating Loss Carryforwards [Line Items]
Tax effected operating loss carryforwards	44.6
Tax credit carryforwards	0.0
Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	1.0
Tax effected operating loss carryforwards	0.2
Tax effected operating loss carryforwards, valuation allowances	0.0
Tax effected operating loss carryforwards, net	0.2
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	1.0
Tax effected operating loss carryforwards	0.2
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	14.1
Tax effected operating loss carryforwards, valuation allowances	(0.6)
Deferred Tax Assets, Operating Loss Carryforwards net of federal tax benefit on State Losses	1.6
Tax effected operating loss carryforwards, net	1.0
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	14.1
Tax effected operating loss carryforwards	1.6
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	185.6
Tax effected operating loss carryforwards	44.7
Tax effected operating loss carryforwards, valuation allowances	(5.8)
Tax effected operating loss carryforwards, net	38.9
International [Member] | Within One Year [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, gross	0.4
Tax effected operating loss carryforwards	0.1
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	185.2
Tax effected operating loss carryforwards	$ 44.6

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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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Liability for Uncertain Tax Positions presented net in underlying deferred tax asset

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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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