XML 135 R121.htm IDEA: XBRL DOCUMENT v3.8.0.1
STOCK-BASED COMPENSATION - Performance Based Stock Award Program (Details) - $ / shares
12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Key Assumptions:      
Expected volatility 24.00% 25.00% 28.00%
Risk-free interest rate 1.60% 1.20% 1.10%
Expected dividend yield 0.00% 0.00% 0.00%
Trading day average stock price on grant date 20 days    
PSU Grantee Group One | PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
PSUs granted (in shares) 197,645 190,628 148,900
Key Assumptions:      
Expected volatility 26.00% 24.00% 23.00%
Risk-free interest rate 1.34% 0.91% 0.96%
Expected dividend yield 0.00% 0.00% 0.00%
20 trading day average stock price on grant date 17.70% (4.80%) 20.60%
PSU Grantee Group One | 2007 Incentive Plan | PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average per share fair value (in dollars per share) $ 99.96 $ 80.38 $ 88.62