Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Millions	Total	Performance Shares [Member]	Class A Common Stock [Member]	Class B Common Stock [Member]	Restricted Stock [Member]	Restricted Stock Units (RSUs) [Member]
Additional paid-in capital	$ 0.0
Accumulated Other Comprehensive Income (Loss), Net of Tax	(50.6)
Retained earnings	817.1
Issuance of Stock and Warrants for Services or Claims	$ 0.7
Share-based Goods and Nonemployee Services Transaction, Shares Approved for Issuance	50,445
Balance, shares at Feb. 24, 2017	117,323,347
Common stock repurchases	$ (16.0)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	40.3
Payments of Dividends	61.0
Net income	80.7
Dividends	(61.0)
repurchase common stock, APIC	(17.8)
Balance at Feb. 23, 2018	$ 813.3
Balance, shares at Feb. 23, 2018	116,157,443
Stock Repurchased and Retired During Period, Shares	(2,410,671)
Stock Issued During Period, Shares, New Issues		346,744			847,578
Share-based Payment Arrangement, Expense	$ 18.4					$ 13.4
Other Expenses	1.5
Additional paid-in capital	4.6
Accumulated Other Comprehensive Income (Loss), Net of Tax	(10.3)
Retained earnings	819.0
Issuance of Stock and Warrants for Services or Claims	$ 0.8
Share-based Goods and Nonemployee Services Transaction, Shares Approved for Issuance	53,029
Common stock repurchases	$ (4.2)		$ (4.2)	$ 0.0
Common stock repurchases, shares			(300,000)	0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(37.0)
Payments of Dividends	64.3
Net income	126.0
Dividends	(64.3)
repurchase common stock, APIC	0.0
Balance at Feb. 22, 2019	$ 849.8
Balance, shares at Feb. 22, 2019	116,766,610		87,594,913	29,171,697
Stock Repurchased and Retired During Period, Shares	(287,328)
Stock Issued During Period, Shares, New Issues		209,353			634,113
Share-based Payment Arrangement, Expense	$ 16.9					$ 12.7
Other Expenses	(1.7)
Additional paid-in capital	16.4
Accumulated Other Comprehensive Income (Loss), Net of Tax	(47.3)
Retained earnings	880.7
Issuance of Stock and Warrants for Services or Claims	$ 0.7
Share-based Goods and Nonemployee Services Transaction, Shares Approved for Issuance	41,941
Common stock repurchases	$ (8.7)		$ (8.7)	$ 0.0
Common stock repurchases, shares			(500,000)	0
Units issued as common stock, shares						760,628
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(22.0)
Payments of Dividends	69.1
Net income	199.7
Dividends	(69.1)
repurchase common stock, APIC	0.0
Balance at Feb. 28, 2020	$ 970.4
Balance, shares at Feb. 28, 2020	117,202,000		89,589,111	27,612,889
Stock Repurchased and Retired During Period, Shares	(524,379)
Stock Issued During Period, Shares, New Issues		0			917,828
Share-based Payment Arrangement, Expense	$ 16.0					$ 13.3
Other Expenses	4.0
Additional paid-in capital	28.4
Accumulated Other Comprehensive Income (Loss), Net of Tax	(69.3)
Retained earnings	$ 1,011.3