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Accounting for Stock-Based Compensation (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 01, 2016
Mar. 01, 2015
Mar. 01, 2014
Mar. 31, 2016
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Employee Service Share-based Compensation, Unrecognized Compensation Costs on Nonvested Awards       $ 66,000,000  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition       24 months  
Aggregate intrinsic value of options exercised         $ 5,000,000
Common Class A [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share Price       $ 18.51  
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights       one-third increments on each of the first three anniversaries of the award date  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     835,000    
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period       2 years  
Restricted Stock, Performance-Based Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights       one-third increments on each of the first three anniversaries of the award date  
Plan 2000 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights       one-third increments on each of the first three anniversaries of the award date  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       0  
Plan 2009 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights       one-third increments on each of the first three anniversaries of the award date  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       1,122,376  
Plan 2009 [Member] | Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights       one-third increments on each of the first three anniversaries of the award date  
Fair value of units granted $ 170,000 $ 170,000      
Share-based Compensation, Number of Shares Received by Each Director 11,017 3,504      
Plan 2009 Amended and Restated [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized       5,000,000  
Contractual Term of Option Granted Prior to 2005 [Member] | Plan 2000 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share Based Compensation Contractual Term of Option Granted       10 years  
Contractual Term of Option Granted From 2005 Through 2007 [Member] | Plan 2000 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share Based Compensation Contractual Term of Option Granted       8 years  
Contractual Term Of Option Granted From 2008 Through 2011 [Member] | Plan 2000 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share Based Compensation Contractual Term of Option Granted       10 years  
Contractual Term of Option Granted in 2011 or Later [Member] | Plan 2009 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share Based Compensation Contractual Term of Option Granted       10 years