Stockholders' Equity Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 25, 2016	Dec. 27, 2015	Dec. 28, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense		$ 19,096	$ 16,988	$ (86,110)
Amounts reclassified from accumulated other comprehensive loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	[1]	20,327
Amounts reclassified from accumulated other comprehensive loss [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Pension settlement charge		21,294
Total recognized in other comprehensive (income)/loss	[2]	47,472
Income tax expense		18,769
Total reclassification, net of tax		28,703
Selling, General and Administrative Expenses [Member] | Amounts reclassified from accumulated other comprehensive loss [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of prior service credit	[3]	(10,385)
Amortization of actuarial loss	[3]	$ 36,563

[1] All amounts are shown net of noncontrolling interest.

[2] There were no reclassifications relating to noncontrolling interest for the year ended December 25, 2016.

[3] These accumulated other comprehensive income components are included in the computation of net periodic benefit cost for pension and other retirement benefits. See Notes 9 and 10 for additional information