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. 28, 2014	$ 677.1	$ 0.0	$ 0.0					$ 0.0	$ 0.8	$ 676.3
Balance, shares at Feb. 28, 2014					122,876,764
Common stock issuance	0.8							0.8
Common stock issuance, shares					48,064
Common stock repurchases	(36.3)							(14.6)		(21.7)
Common stock repurchases, shares					(2,365,897)
Tax effect of exercise of stock awards	1.6							1.6
Units issued as common stock, shares						453,627	455,989
Performance units and restricted stock units expense	17.6							17.6
Common stock repurchases related to vested but not issued	(0.4)							(0.4)
Other comprehensive income (loss)	(30.2)								(30.2)
Dividends paid	(52.5)									(52.5)
Net income	86.1									86.1
Balance at Feb. 27, 2015	$ 663.8	0.0	0.0					5.0	(29.4)	688.2
Balance, shares at Feb. 27, 2015	121,500,000				121,468,547
Common stock issuance	$ 0.7							0.7
Common stock issuance, shares					39,052
Common stock repurchases	(56.4)	$ (56.4)	$ 0.0					(31.4)		(25.0)
Common stock repurchases, shares		(3,700,000)	0		(3,737,573)
Tax effect of exercise of stock awards	7.0							7.0
Units issued as common stock, shares						1,026,000	574,740
Performance units and restricted stock units expense	20.3							20.3
Common stock repurchases related to vested but not issued	(1.6)							(1.6)
Other comprehensive income (loss)	(10.2)								(10.2)
Dividends paid	(57.0)									(57.0)
Net income	170.3									170.3
Balance at Feb. 26, 2016	$ 736.9	$ 0.0	$ 0.0					0.0	(39.6)	776.5
Balance, shares at Feb. 26, 2016	119,400,000	87,759,355	31,611,411		119,370,766
Common stock issuance	$ 0.7							0.7
Common stock issuance, shares					48,045
Common stock repurchases	(48.4)	$ (48.4)	$ 0.0					(22.9)		(25.5)
Common stock repurchases, shares		(3,500,000)	0		(3,507,238)
Tax effect of exercise of stock awards	3.3
Units issued as common stock, shares				846,337		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)
Dividends paid	(58.5)									(58.5)
Net income	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	85,975,298	31,348,049		117,323,347