Annual report pursuant to Section 13 and 15(d)

RETIREMENT AND SAVINGS BENEFIT PLANS - Fair Value of Investments Held by Defined Benefit Plan (Details)

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RETIREMENT AND SAVINGS BENEFIT PLANS - Fair Value of Investments Held by Defined Benefit Plan (Details) - Pension Plan - USD ($)
$ in Thousands
Mar. 30, 2019
Mar. 31, 2018
Dec. 30, 2017
Dec. 31, 2016
Defined Benefit Plan, Plan Assets, Valuation Technique and Inputs [Abstract]        
Total plan assets in the fair value hierarchy $ 74,204 $ 75,055 $ 77,275  
Total plan assets measured at net asset value 1,676,890 1,676,705 1,732,374  
Total plan assets 1,751,094 1,751,760 1,809,649 $ 1,673,297
Cash equivalents        
Defined Benefit Plan, Plan Assets, Valuation Technique and Inputs [Abstract]        
Total plan assets measured at net asset value 36,349 38,833 36,313  
Total plan assets 3,023 14,694 8,191  
U.S. Treasury and government agencies        
Defined Benefit Plan, Plan Assets, Valuation Technique and Inputs [Abstract]        
Total plan assets 7 8 8  
Insurance contracts        
Defined Benefit Plan, Plan Assets, Valuation Technique and Inputs [Abstract]        
Total plan assets 71,521 67,444 69,448  
Commodities        
Defined Benefit Plan, Plan Assets, Valuation Technique and Inputs [Abstract]        
Total plan assets (347) (7,091) (372)  
Corporate and international bonds        
Defined Benefit Plan, Plan Assets, Valuation Technique and Inputs [Abstract]        
Total plan assets measured at net asset value 1,309,123 1,211,103 1,215,558  
Alternative investments        
Defined Benefit Plan, Plan Assets, Valuation Technique and Inputs [Abstract]        
Total plan assets measured at net asset value 150,993 156,481 154,741  
Domestic | Equity Securities        
Defined Benefit Plan, Plan Assets, Valuation Technique and Inputs [Abstract]        
Total plan assets measured at net asset value 82,659 114,958 152,154  
International | Equity Securities        
Defined Benefit Plan, Plan Assets, Valuation Technique and Inputs [Abstract]        
Total plan assets measured at net asset value 97,766 155,330 173,608  
Level 1        
Defined Benefit Plan, Plan Assets, Valuation Technique and Inputs [Abstract]        
Total plan assets 2,676 7,603 7,819  
Level 1 | Cash equivalents        
Defined Benefit Plan, Plan Assets, Valuation Technique and Inputs [Abstract]        
Total plan assets 3,023 14,694 8,191  
Level 1 | U.S. Treasury and government agencies        
Defined Benefit Plan, Plan Assets, Valuation Technique and Inputs [Abstract]        
Total plan assets 0 0 0  
Level 1 | Insurance contracts        
Defined Benefit Plan, Plan Assets, Valuation Technique and Inputs [Abstract]        
Total plan assets 0 0 0  
Level 1 | Commodities        
Defined Benefit Plan, Plan Assets, Valuation Technique and Inputs [Abstract]        
Total plan assets (347) (7,091) (372)  
Level 2        
Defined Benefit Plan, Plan Assets, Valuation Technique and Inputs [Abstract]        
Total plan assets 71,528 67,452 69,456  
Level 2 | Cash equivalents        
Defined Benefit Plan, Plan Assets, Valuation Technique and Inputs [Abstract]        
Total plan assets 0 0 0  
Level 2 | U.S. Treasury and government agencies        
Defined Benefit Plan, Plan Assets, Valuation Technique and Inputs [Abstract]        
Total plan assets 7 8 8  
Level 2 | Insurance contracts        
Defined Benefit Plan, Plan Assets, Valuation Technique and Inputs [Abstract]        
Total plan assets 71,521 67,444 69,448  
Level 2 | Commodities        
Defined Benefit Plan, Plan Assets, Valuation Technique and Inputs [Abstract]        
Total plan assets 0 0 0  
Level 3        
Defined Benefit Plan, Plan Assets, Valuation Technique and Inputs [Abstract]        
Total plan assets 0 0 0  
Level 3 | Cash equivalents        
Defined Benefit Plan, Plan Assets, Valuation Technique and Inputs [Abstract]        
Total plan assets 0 0 0  
Level 3 | U.S. Treasury and government agencies        
Defined Benefit Plan, Plan Assets, Valuation Technique and Inputs [Abstract]        
Total plan assets 0 0 0  
Level 3 | Insurance contracts        
Defined Benefit Plan, Plan Assets, Valuation Technique and Inputs [Abstract]        
Total plan assets 0 0 0  
Level 3 | Commodities        
Defined Benefit Plan, Plan Assets, Valuation Technique and Inputs [Abstract]        
Total plan assets $ 0 $ 0 $ 0