Stockholders' Equity Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 27, 2015	Dec. 28, 2014	Dec. 29, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning		$ (533,795)
Income tax expense		16,988	$ (86,110)	$ 73,165
Other comprehensive income/(loss), net of tax		24,788	(131,785)	110,517
Balance, ending		(509,094)	(533,795)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning		5,705
Other comprehensive income before reclassifications, before tax(1)	[1]	(8,803)
Amounts reclassified from accumulated other comprehensive loss, before tax(1)	[1]	0
Income tax expense	[1]	(3,115)
Other comprehensive income/(loss), net of tax		(5,688)
Balance, ending		17	5,705
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning		(539,500)
Other comprehensive income before reclassifications, before tax(1)	[1]	(25,236)
Amounts reclassified from accumulated other comprehensive loss, before tax(1)	[1]	75,728
Income tax expense	[1]	20,103
Other comprehensive income/(loss), net of tax		30,389
Balance, ending		(509,111)	(539,500)
Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning		(533,795)
Other comprehensive income before reclassifications, before tax(1)	[1]	(34,039)
Amounts reclassified from accumulated other comprehensive loss, before tax(1)	[1]	75,728
Income tax expense	[1]	16,988
Other comprehensive income/(loss), net of tax		24,701	(131,184)	$ 109,955
Balance, ending		$ (509,094)	$ (533,795)

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