Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation and Other Compensation Matters (Details 4)

v3.8.0.1
Share-Based Compensation and Other Compensation Matters (Details 4) - Performance share units [Member] - $ / shares
12 Months Ended
Jan. 01, 2017
Mar. 01, 2016
Mar. 05, 2015
Dec. 31, 2017
Potential earned PSUs payout for defined levels of performance under awards        
Earned PSUs payout (as a percent of PSUs granted) on 75th or greater percentile rank       200.00%
Earned PSUs payout (as a percent of PSUs granted) on 50th percentile rank       100.00%
Earned PSUs payout (as a percent of PSUs granted) on 25th percentile rank       50.00%
Performance share units granted on percentile rank below 25th (as a percent)       0.00%
2015 PSU Grants [Member]        
Assumptions used to value stock awards        
Grant date fair value (in dollars per share)     $ 36.76  
Baseline Common Share Value (in dollars per share)     $ 29.28  
Expected Volatility of Common Shares     19.90%  
Risk-free Interest Rate     0.99%  
2016 PSU Grants [Member]        
Assumptions used to value stock awards        
Grant date fair value (in dollars per share)   $ 38.21    
Baseline Common Share Value (in dollars per share)   $ 23.90    
Expected Volatility of Common Shares   20.40%    
Risk-free Interest Rate   0.96%    
2017 PSU Grants [Member]        
Assumptions used to value stock awards        
Grant date fair value (in dollars per share) $ 38.43      
Baseline Common Share Value (in dollars per share) $ 31.22      
Expected Volatility of Common Shares 19.00%      
Risk-free Interest Rate 1.47%