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Note 3 - Accounting for Share-Based Compensation (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Feb. 27, 2016
Feb. 28, 2015
Employee Stock Option [Member]    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options $ 10,748  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 219 days  
Restricted Stock [Member]    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 328 days  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options $ 436  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 5,833 $ 6,000
Restricted Stock Units (RSUs) [Member]    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 255 days  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options $ 11,631  
Employees [Member]    
Deferred Compensation Plan, Matching Percentage 10.00%  
Allocated Share-based Compensation Expense $ 4,267 4,261
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation 341  
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options   397
Fair Value Options Granted During Period Value Share-based Compensation 6,138 7,180
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value 11 1,326
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options 32 $ 1,684
Total Fair Value of Nonvested Restricted Stock $ 13,707  
Repurchased Restricted Stock Shares 66,447 53,917