Description of the maximum estimated period of time over which an employee is required to provide service in exchange for the equity-based payment award before the vesting period commences. This period may be explicit or implicit based on the terms of the award, and may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year).

No definition available.

Note 9 - Stock-based Compensation (Details Textual) - USD ($) $ / shares in Units, shares in Millions	3 Months Ended		6 Months Ended
	Aug. 27, 2016	Aug. 29, 2015	Aug. 27, 2016	Aug. 29, 2015
The 2012 Plan [Member] \| Employee Stock Option [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			3 years
The 2012 Plan [Member] \| Employee Stock Option [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			5 years
The 2012 Plan [Member] \| Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			5 years
Share Based Compensation Arrangement By Share Based Payment Award Award Requisite Service Period Minimum			1 year
Share Based Compensation Arrangement By Share Based Payment Award Award Requisite Service Period Maximum			3 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 11.87	$ 23.12
The 2012 Plan [Member] \| Performance Share Units [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award Target Award Percentage	0.00%		0.00%
The 2012 Plan [Member] \| Performance Share Units [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award Target Award Percentage	150.00%		150.00%
The 2012 Plan [Member] \| Performance Share Units [Member] \| One-year Performance Period Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			3 years
The 2012 Plan [Member] \| Performance Share Units [Member] \| Scenario Assumption [Member]
Share Based Compensation Arrangement By Share Based Payment Award Target Award Percentage	100.00%		100.00%
The 2012 Plan [Member] \| Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			4 years
The 2012 Plan [Member] \| Employee Stock Option Issued Since May 10, 2010 [Member]
Share Based Compensation Arrangement By Share Based Payment Award Requisite Service Period			1 year
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period			8 years
The 2012 Plan [Member] \| Employee Stock Option Issued Prior To May 10, 2010 [Member]
Share Based Compensation Arrangement By Share Based Payment Award Award Requisite Service Period Minimum			1 year
Share Based Compensation Arrangement By Share Based Payment Award Award Requisite Service Period Maximum			3 years
The 2012 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	43.2		43.2
Employee Stock Option [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 26,200,000		$ 26,200,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			3 years 146 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term			4 years 219 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	6,200,000		$ 6,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term			3 years 36 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	6,200,000		$ 6,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value			9,000,000	$ 8,200,000
Proceeds from Stock Options Exercised			20,300,000
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options			4,200,000
Performance Share Units [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	35,500,000		$ 35,500,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			2 years 109 days
Restricted Stock [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	154,600,000		$ 154,600,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			4 years 182 days
Allocated Share-based Compensation Expense	16,800,000	$ 16,100,000	$ 37,600,000	33,900,000
Allocated Share-based Compensation Expense, Net of Tax	$ 10,700,000	$ 10,000,000	$ 23,700,000	$ 21,100,000
Stock Based Compensation Expense Impact On Diluted Earnings Per Share	$ 0.07	$ 0.06	$ 0.16	$ 0.12
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount			$ 1,100,000	$ 1,000,000
Proceeds from Stock Options Exercised			$ 20,258,000	$ 7,879,000