Note 8 - Accounting for Share-based Compensation (Details Textual) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 01, 2018	Sep. 02, 2017	Sep. 01, 2018	Sep. 02, 2017
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation		$ 151		$ 1,504
Fair Value Options Granted During Period Value Share-based Compensation	$ 180	46	$ 9,217	7,803
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	2,066	474	3,876	7,099
Proceeds from Stock Options Exercised	2,841	1,107	5,228	15,033
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	278	$ 250	8,755	$ 7,643
Total Fair Value of Nonvested Restricted Stock	$ 19,831		$ 19,831
Repurchased Restricted Stock Shares	1,945	1,837	68,881	55,646
Deferred Compensation Plan, Matching Percentage			10.00%
Employee Stock Option [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total	$ 14,784		$ 14,784
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			1 year 146 days
Restricted Stock Units (RSUs) [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total	11,749		$ 11,749
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			1 year 73 days
Selling, General and Administrative Expenses [Member]
Allocated Share-based Compensation Expense, Total	$ 5,005	$ 3,191	$ 15,439	$ 12,034

Percent matched on deferred compensation investment.

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Fair value of options granted during the period.

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Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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