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Plans Fair Value of Plan Assets by Asset Class (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 28, 2019
Dec. 31, 2018
Dec. 29, 2018
Dec. 30, 2017
Pension plans          
Schedule of Pension Plan Assets by Fair Value [Line Items]          
Fair value of plan assets $ 360,675 $ 360,675 $ 335,540 $ 335,540 $ 340,854
Short Term Investments And Cash          
Schedule of Pension Plan Assets by Fair Value [Line Items]          
Fair value of plan assets 107,010   34,118    
Common Stocks | International Common Stocks          
Schedule of Pension Plan Assets by Fair Value [Line Items]          
Fair value of plan assets 6,844        
Common Stocks | U.S. Common Stocks          
Schedule of Pension Plan Assets by Fair Value [Line Items]          
Fair value of plan assets 11,990        
Fixed Income Securities | US Treasury Securities          
Schedule of Pension Plan Assets by Fair Value [Line Items]          
Fair value of plan assets 14,911   4,581    
Fixed Income Securities | US Government Agencies Debt Securities          
Schedule of Pension Plan Assets by Fair Value [Line Items]          
Fair value of plan assets 3,806   3,561    
Fixed Income Securities | Domestic Corporate Debt Securities          
Schedule of Pension Plan Assets by Fair Value [Line Items]          
Fair value of plan assets 150,840   166,670    
Fixed Income Securities | International Corporate Bonds          
Schedule of Pension Plan Assets by Fair Value [Line Items]          
Fair value of plan assets 63,050   53,709    
Pending Transactions          
Schedule of Pension Plan Assets by Fair Value [Line Items]          
Fair value of plan assets [1] (13)   59,452    
Other Assets And Liabilities          
Schedule of Pension Plan Assets by Fair Value [Line Items]          
Fair value of plan assets and (liabilities) [1] (52)   2,636    
Accrued (Expenses) Income          
Schedule of Pension Plan Assets by Fair Value [Line Items]          
Fair value of plan assets [1] 2,289   (40)    
Level 1 | Pension plans          
Schedule of Pension Plan Assets by Fair Value [Line Items]          
Fair value of plan assets 136,957        
Level 1 | Short Term Investments And Cash          
Schedule of Pension Plan Assets by Fair Value [Line Items]          
Fair value of plan assets 103,212        
Level 1 | Common Stocks | International Common Stocks          
Schedule of Pension Plan Assets by Fair Value [Line Items]          
Fair value of plan assets 6,844        
Level 1 | Common Stocks | U.S. Common Stocks          
Schedule of Pension Plan Assets by Fair Value [Line Items]          
Fair value of plan assets 11,990        
Level 1 | Fixed Income Securities | US Treasury Securities          
Schedule of Pension Plan Assets by Fair Value [Line Items]          
Fair value of plan assets 14,911        
Level 2 | Pension plans          
Schedule of Pension Plan Assets by Fair Value [Line Items]          
Fair value of plan assets 221,494   262,639    
Level 2 | Short Term Investments And Cash          
Schedule of Pension Plan Assets by Fair Value [Line Items]          
Fair value of plan assets 3,798   34,118    
Level 2 | Fixed Income Securities | US Treasury Securities          
Schedule of Pension Plan Assets by Fair Value [Line Items]          
Fair value of plan assets     4,581    
Level 2 | Fixed Income Securities | US Government Agencies Debt Securities          
Schedule of Pension Plan Assets by Fair Value [Line Items]          
Fair value of plan assets 3,806   3,561    
Level 2 | Fixed Income Securities | Domestic Corporate Debt Securities          
Schedule of Pension Plan Assets by Fair Value [Line Items]          
Fair value of plan assets 150,840   166,670    
Level 2 | Fixed Income Securities | International Corporate Bonds          
Schedule of Pension Plan Assets by Fair Value [Line Items]          
Fair value of plan assets $ 63,050   53,709    
Other Investments Measured at Contract Value | Guaranteed Insurance Contracts          
Schedule of Pension Plan Assets by Fair Value [Line Items]          
Fair value of plan assets [2]     $ 10,853    
[1] This class includes accrued interest, dividends, and amounts receivable from asset sales and amounts payable for asset purchases.
[2] This class invests primarily guaranteed insurance contracts through various U.S. insurance companies.  This fully-benefit responsive investment contract is measured at contract value and is not classified in the fair value hierarchy.