Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Millions	Total	Class A Common Stock [Member]	Class B Common Stock [Member]	Restricted Stock Units (RSUs) [Member]	Common Shares Outstanding [Member]	Common Shares Outstanding [Member] Performance Units [Member]	Common Shares Outstanding [Member] Restricted Stock Units (RSUs) [Member]	Additional Paid-In Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]
Balance at Feb. 26, 2016	$ 736.9	$ 0.0	$ 0.0					$ 0.0	$ (39.6)	$ 776.5
Balance, shares at Feb. 26, 2016					119,370,766
Common stock issuance	0.7							0.7
Common stock issuance, shares					48,045
Common stock repurchases	(48.4)							(22.9)		(25.5)
Common stock repurchases, shares					(3,507,238)
Tax effect of exercise of stock awards	3.3							3.3
Units issued as common stock, shares						469,232	942,542
Performance units and restricted stock units expense	19.1							19.1
Common stock repurchases related to vested but not issued	(0.2)							(0.2)
Other comprehensive income (loss)	(11.0)								(11.0)
Payments of Dividends	58.5
Dividends paid	(58.5)									(58.5)
Net income	124.6									124.6
Balance at Feb. 24, 2017	$ 766.5	0.0	0.0					0.0	(50.6)	817.1
Balance, shares at Feb. 24, 2017	117,300,000				117,323,347
Common stock issuance	$ 0.7							0.7
Common stock issuance, shares					50,445
Common stock repurchases	(33.8)	$ (33.8)	$ 0.0					(16.0)		(17.8)
Common stock repurchases, shares		(2,400,000)	0		(2,410,671)
Units issued as common stock, shares						346,744	847,578
Performance units and restricted stock units expense	18.4							18.4
Common stock repurchases related to vested but not issued	1.5							1.5
Other comprehensive income (loss)	40.3								40.3
Payments of Dividends	61.0
Dividends paid	(61.0)									(61.0)
Net income	80.7									80.7
Balance at Feb. 23, 2018	$ 813.3	$ 0.0	$ 0.0					4.6	(10.3)	819.0
Balance, shares at Feb. 23, 2018	116,200,000	85,728,770	30,428,673		116,157,443
Common stock issuance	$ 0.8							0.8
Common stock issuance, shares					53,029
Common stock repurchases	(4.2)	$ (4.2)	$ 0.0					(4.2)
Common stock repurchases, shares		(300,000)	0		(287,328)
Units issued as common stock, shares				882,940		209,353	634,113
Performance units and restricted stock units expense	16.9							16.9
Common stock repurchases related to vested but not issued	(1.7)							(1.7)
Other comprehensive income (loss)	(37.0)								(37.0)
Payments of Dividends	64.3
Dividends paid	(64.3)
Net income	126.0
Balance at Feb. 22, 2019	$ 849.8	$ 0.0	$ 0.0					$ 16.4	$ (47.3)	$ 880.7
Balance, shares at Feb. 22, 2019	116,800,000	87,594,913	29,171,697		116,766,610