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Summary of Significant Accounting Policies Environmental Contingencies (Details) - USD ($) $ in Millions	Feb. 23, 2018	Feb. 24, 2017
Accounting Policies [Abstract]
Accrued Environmental Loss Contingencies, Current	$ 0.7	$ 0.6
Accrued Environmental Loss Contingencies, Noncurrent	2.5	3.3
Accrual for Environmental Loss Contingencies, Gross	$ 3.2	$ 3.9

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer.

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