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New Accounting Standards Accounting Standards Update 2017-07 (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Feb. 22, 2019	Nov. 23, 2018	Aug. 24, 2018	May 25, 2018	Feb. 23, 2018	Nov. 24, 2017	Aug. 25, 2017	May 26, 2017	Feb. 22, 2019	Feb. 23, 2018	Feb. 24, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of sales									$ 2,355.3	$ 2,050.3	$ 2,020.6
Operating expenses									904.3	850.0	810.5
Operating income (loss)	$ 47.0	$ 45.4	$ 67.9	$ 23.3	$ 31.4	$ 36.5	$ 52.2	$ 35.1	$ 183.6	155.2	196.2
Accounting Standards Update 2017-07 [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of sales										(0.9)	(2.8)
Operating expenses										0.1	(1.2)
Operating income (loss)										0.8	4.0
Other Income										0.8	4.0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest										0.0	$ 0.0
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment										$ 7.1