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Income Taxes Income Tax Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 26, 2021	Feb. 28, 2020	Feb. 22, 2019
U.S. federal statutory tax rate	21.00%
Tax expense at the U.S. federal statutory rate	$ 5.4	$ 51.5	$ 34.4
Valuation allowance provisions and adjustments	0.4	(1.3)	(1.3)
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount	3.4	0.0	0.0
COLI income	(2.7)	(1.4)	(1.6)
Effective Income Tax Rate Reconciliation, Tax Settlement, Foreign, Amount	5.4	4.9	7.8
State and local income taxes, net of federal	0.6	6.4	5.7
Foreign operations, less applicable foreign tax credits	0.4	(1.2)	(0.8)
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	1.9	1.1	1.0
Research tax credit	(3.0)	(2.9)	(2.9)
Other	(0.3)	0.0	(4.4)
Income tax expense	(0.2)	45.5	37.9
Effective Income Tax Reconciliation, CARES	(11.7)	0.0	0.0
Effective Income Tax Rate Reconciliation, Disposition of Business, Amount	$ 0.0	$ (11.6)	$ 0.0

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