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Shareholders' Equity - (Components of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 24, 2020
Dec. 30, 2020
Dec. 25, 2019
Dec. 26, 2018
AOCI Attributable To Parent, Net Of Tax [Roll Forward]        
Balance as of beginning period   $ (138,064) $ (133,345) $ (97,360)
Settlement loss recognized   95 0  
Income tax benefit   9,432 10,320 250
Balance as of end of period   (130,446) (138,064) (133,345)
Pensions        
AOCI Attributable To Parent, Net Of Tax [Roll Forward]        
Balance as of beginning period   (781) (827) (982)
Benefit obligation actuarial gain (loss)   (448) (25) 96
Settlement loss recognized   95    
Income tax benefit   67 (15) (53)
Balance as of end of period   (978) (781) (827)
Derivatives        
AOCI Attributable To Parent, Net Of Tax [Roll Forward]        
Balance as of beginning period   (33,179) (3,319) (1,334)
Reclassification   3,160 291 307
Changes in the fair value of cash flow derivatives   (46,910) (40,486) (2,595)
Income tax benefit   9,365 10,335 303
Balance as of end of period   (59,427) (33,179) (3,319)
Estimated reclassification from other comprehensive loss to interest expense related to the interest rate swaps over the next 12 months   3,900    
Derivatives        
AOCI Attributable To Parent, Net Of Tax [Roll Forward]        
Reclassification $ 7,400 7,354    
Derivatives        
AOCI Attributable To Parent, Net Of Tax [Roll Forward]        
Reclassification   783    
Estimated reclassification from other comprehensive loss to interest expense related to the interest rate swaps over the next 12 months   200    
Amortization of net loss        
AOCI Attributable To Parent, Net Of Tax [Roll Forward]        
Reclassification   89 86 112
Accumulated Other Comprehensive Loss        
AOCI Attributable To Parent, Net Of Tax [Roll Forward]        
Balance as of beginning period   (33,960) (4,146) (2,316)
Balance as of end of period   $ (60,405) $ (33,960) $ (4,146)