New Accounting Standards Narrative (Details) - USD ($) $ in Millions	3 Months Ended					9 Months Ended		12 Months Ended
	Nov. 23, 2018	Feb. 23, 2018	Nov. 24, 2017	Aug. 25, 2017	May 26, 2017	Nov. 23, 2018	Nov. 24, 2017	Feb. 23, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of sales	$ (622.7)		$ (521.3)			$ (1,726.0)	$ (1,529.6)
Operating expenses	(232.9)		(214.3)			(668.2)	(629.4)
Operating income	(45.4)		(36.5)			(136.6)	(123.8)
Other Nonoperating Income (Expense)	4.3		5.2			11.3	4.9
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	$ 45.2		37.7			$ 135.6	$ 116.8
Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of sales		$ 1.1	1.0	$ 1.1	$ (2.3)			$ 0.9
Operating expenses		0.9	1.0	0.9	(2.9)			(0.1)
Operating income		(2.0)	(2.0)	(2.0)	5.2			(0.8)
Other Nonoperating Income (Expense)		2.0	2.0	2.0	(5.2)			0.8
Other Nonoperating Income (Expense)					7.1
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest		$ 0.0	$ 0.0	$ 0.0	$ 0.0			$ 0.0