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Income Taxes - Net Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 25, 2016
Dec. 27, 2015
Deferred tax assets    
Retirement, postemployment and deferred compensation plans $ 275,611 $ 309,711
Accruals for other employee benefits, compensation, insurance and other 34,466 32,731
Accounts receivable allowances 2,450 1,690
Net operating losses 2,598 38,703
Investment in joint ventures 5,329 0
Other 39,943 44,099
Gross deferred tax assets 360,397 426,934
Valuation allowance 0 (36,204)
Net deferred tax assets 360,397 390,730
Deferred tax liabilities    
Property, plant and equipment 46,284 57,065
Intangible assets 11,975 10,790
Investments in joint ventures 0 11,694
Other 796 2,039
Gross deferred tax liabilities 59,055 81,588
Net deferred tax asset $ 301,342 $ 309,142
Valuation allowance, period for recoverability measurement 3 years