Note 8 - Stock-Based Compensation (Details Textual) - USD ($) $ / shares in Units, shares in Millions | 3 Months Ended | 6 Months Ended |
Aug. 29, 2015 | Aug. 30, 2014 | Aug. 29, 2015 | Aug. 30, 2014 |
The 2012 Plan [Member] | Restricted Stock [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 | |
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 | | | $ 23.12 | $ 20.96 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term | | | 4 years 73 days | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | $ 42,600,000 | | $ 42,600,000 | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term | | | 2 years 328 days | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value | $ 40,600,000 | | $ 40,600,000 | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | | | 8,200,000 | $ 6,400,000 |
Proceeds from Stock Options Exercised | | | 7,900,000 | |
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options | | | $ 10,200,000 | |
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 | |
Share Based Compensation Arrangement By Share Based Payment Award Award Requisite Service Period Minimum | | | 1 year | |
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 | |
Restricted Stock [Member] | | | | |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 148,900,000 | | $ 148,900,000 | |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | | | 4 years 36 days | |
Employee Stock Option [Member] | | | | |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | 28,800,000 | | $ 28,800,000 | |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | | | 3 years 73 days | |
Performance Share Units [Member] | | | | |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | 30,100,000 | | $ 30,100,000 | |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | | | 2 years 182 days | |
Allocated Share-based Compensation Expense | 16,100,000 | $ 15,600,000 | $ 33,900,000 | 33,800,000 |
Allocated Share-based Compensation Expense, Net of Tax | $ 10,000,000 | $ 9,700,000 | $ 21,100,000 | $ 21,100,000 |
Stock Based Compensation Expense Impact On Diluted Earnings Per Share | $ 0.06 | $ 0.05 | $ 0.12 | $ 0.11 |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount | | | $ 1,000,000 | $ 900,000 |
Proceeds from Stock Options Exercised | | | $ 7,879,000 | $ 9,704,000 |