Shareholders' Deficit - Components of Accumulated Other Comprehensive Loss (Details) $ in Thousands	9 Months Ended
	Sep. 25, 2019 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance as of beginning of period	$ (133,345)
Net change in fair value of derivatives	(51,412)
Income tax (expense) benefit related to items of other comprehensive loss	13,546
Balance as of end of period	(118,746)
Defined Benefit Plans [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance as of beginning of period	(827)
Reclassification	65
Income tax (expense) benefit related to items of other comprehensive loss	(17)
Balance as of end of period	(779)
Derivatives [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance as of beginning of period	(3,319)
Reclassification	40
Net change in fair value of derivatives	(51,412)
Income tax (expense) benefit related to items of other comprehensive loss	13,563
Balance as of end of period	(41,128)
Accumulated Other Comprehensive Income (Loss) [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance as of beginning of period	(4,146)
Balance as of end of period	$ (41,907)