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STOCK-BASED COMPENSATION - Performance Share Awards – Peer Group Market Condition Vesting (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jan. 23, 2019
Jan. 24, 2018
Jan. 23, 2018
Aug. 04, 2017
Feb. 03, 2017
Jun. 30, 2019
Peer Group Market Condition Vesting | Equity Award Agreements            
Award agreements            
Period after change of control for equity award to fully vest upon termination of employment without cause or resignation       24 months    
Performance Shares            
Stock-based compensation            
Performance period     3 years      
Performance Shares | Peer Group Market Condition Vesting            
Stock-based compensation            
Performance period   3 years     3 years  
Shares            
Outstanding (in shares)           28,080
Granted (in shares) 21,195 15,445     12,635 21,195
Outstanding (in shares)           49,275
Weighted Average Fair Value            
Outstanding (in dollars per share)           $ 66.29
Granted (in dollars per share           64.66
Outstanding (in dollars per share)           $ 65.59
Compensation cost            
Unrecognized compensation cost           $ 1.8
Weighted average period of recognition of unrecognized compensation cost           2 years 1 month 6 days
Performance Shares | Minimum | Peer Group Market Condition Vesting            
Stock-based compensation            
Vesting percentage 0.00% 0.00%     0.00%  
Performance Shares | Maximum | Peer Group Market Condition Vesting            
Stock-based compensation            
Vesting percentage 150.00% 150.00%     150.00%