Shareholders' Deficit - Components of Accumulated Other Comprehensive Loss (Details) $ in Thousands	6 Months Ended
	Jun. 24, 2020 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance as of beginning of period	$ (138,064)
Income tax (expense) benefit related to items of other comprehensive loss	10,174
Balance as of end of period	(217,507)
Defined Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance as of beginning of period	(781)
Reclassification	45
Income tax (expense) benefit related to items of other comprehensive loss	(12)
Balance as of end of period	(748)
Derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance as of beginning of period	(33,179)
Derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification	1,626
Changes in the fair value of cash flow derivatives	(47,725)
Income tax (expense) benefit related to items of other comprehensive loss	10,186
Balance as of end of period	(61,469)
Derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification	(7,354)
Derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification	269
Accumulated Other Comprehensive Loss, Net
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance as of beginning of period	(33,960)
Balance as of end of period	$ (62,217)