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Incentive Plans and Stock-Based Compensation (Details 1) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 01, 2012
Dec. 03, 2011
Nov. 27, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Excess tax benefits (expense) associated with tax deductions over (under) the amount of compensation expense recognized in the consolidated financial statements $ (2,007) $ (5,100) $ (2,457)
Stock Issued During Period, Value, Restricted Stock Award And Employee Stock Purchase Plan And Share Based Compensation 1,868 2,001 1,770
Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Pre-tax compensation expense 4,997 4,397 3,632
Deferred tax benefits (1,836) (1,616) (1,335)
Excess tax benefits (expense) associated with tax deductions over (under) the amount of compensation expense recognized in the consolidated financial statements (2,007) (5,100) (2,457)
Fair value of share-based awards on date of grant 6,407 5,803 4,213
Total intrinsic value of stock options exercised 8,793 16,732 7,547
Cash received upon exercise of stock options 5,170 7,233 5,703
Addition to capital in excess of par value due to exercise of stock options 5,440 8,045 7,313
Unrecognized compensation cost related to share-based awards which the Company expects to recognize 5,075    
Weighted-average period in years, over which the Company expects to recognize compensation cost related to share-based arrangements 2 years 4 months 28 days    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Weighted average fair value per option at the date of grant for option granted $ 12.49 $ 11.73 $ 8.73
Risk-free interest rate 1.38% 2.52% 2.84%
Expected dividend yield 0.96% 0.98% 1.02%
Expected volatility factor 26.52% 25.54% 26.00%
Expected option term in years 6 years 1 month 6 days 6 years 4 months 24 days 6 years 2 months 12 days
Restricted Stock Units (RSUs) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Pre-tax compensation expense 1,229 1,079 970
Deferred tax benefits (451) (396) (357)
Excess tax benefits (expense) associated with tax deductions over (under) the amount of compensation expense recognized in the consolidated financial statements 88 (3) 111
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Grants in Period, Grant Date Fair Value 1,489 1,263 1,102
Fair value of restricted stock unit awards vested 2,359 905 983
Unrecognized compensation cost related to share-based awards which the Company expects to recognize 997    
Weighted-average period in years, over which the Company expects to recognize compensation cost related to share-based arrangements 2 years 4 months 24 days    
Directors' Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Pre-tax compensation expense 200 200 240
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures 4,055 4,540 6,760
Employee Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock Issued During Period, Value, Restricted Stock Award And Employee Stock Purchase Plan And Share Based Compensation $ 1,244 $ 1,216 $ 1,096