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FAIR VALUE - Asset Measured at Fair Value (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 30, 2017
Mar. 31, 2018
Apr. 01, 2017
Fixed Income | Restricted Investments      
Fair Value      
Securities transferred to collateral trust account $ 4,100    
Securities purchased and held in the collateral trust account $ 3,800    
Estimate of Fair Value Measurement | Recurring      
Fair Value      
Investments at fair value   $ 25,176 $ 15,457
Assets at fair value   25,176 15,457
Estimate of Fair Value Measurement | Recurring | Money market funds      
Fair Value      
Investments at fair value   4,809 4,628
Estimate of Fair Value Measurement | Recurring | Fixed Income      
Fair Value      
Investments at fair value   9,270 4,055
Estimate of Fair Value Measurement | Recurring | Equity      
Fair Value      
Investments at fair value   7,202 5,928
Estimate of Fair Value Measurement | Recurring | Mutual Fund      
Fair Value      
Investments at fair value   3,895 846
Estimate of Fair Value Measurement | Recurring | Domestic stock funds      
Fair Value      
Investments at fair value   1,158 316
Estimate of Fair Value Measurement | Recurring | International stock funds      
Fair Value      
Investments at fair value   1,159 81
Estimate of Fair Value Measurement | Recurring | Target funds      
Fair Value      
Investments at fair value   1,024 246
Estimate of Fair Value Measurement | Recurring | Bond funds      
Fair Value      
Investments at fair value   554 203
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1)      
Fair Value      
Investments at fair value   12,231 10,893
Assets at fair value   12,231 10,893
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Money market funds      
Fair Value      
Investments at fair value   65 64
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Fixed Income      
Fair Value      
Investments at fair value   2,159 4,055
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Equity      
Fair Value      
Investments at fair value   7,202 5,928
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Mutual Fund      
Fair Value      
Investments at fair value   2,805 846
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Domestic stock funds      
Fair Value      
Investments at fair value   1,158 316
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | International stock funds      
Fair Value      
Investments at fair value   1,159 81
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Target funds      
Fair Value      
Investments at fair value   281 246
Estimate of Fair Value Measurement | Recurring | Quoted Prices in Active Markets (Level 1) | Bond funds      
Fair Value      
Investments at fair value   207 203
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2)      
Fair Value      
Investments at fair value   12,945 4,564
Assets at fair value   12,945 4,564
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) | Money market funds      
Fair Value      
Investments at fair value   4,744 $ 4,564
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) | Fixed Income      
Fair Value      
Investments at fair value   7,111  
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) | Mutual Fund      
Fair Value      
Investments at fair value   1,090  
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) | Target funds      
Fair Value      
Investments at fair value   743  
Estimate of Fair Value Measurement | Recurring | Prices with Other Observable Inputs (Level 2) | Bond funds      
Fair Value      
Investments at fair value   $ 347