Shareholders' Deficit - Share Repurchase (Details) - USD ($) $ / shares in Units, shares in Thousands	1 Months Ended	3 Months Ended			9 Months Ended
	Nov. 30, 2018	Mar. 25, 2020	Sep. 25, 2019	Mar. 27, 2019	Sep. 23, 2020	Sep. 25, 2019	Dec. 25, 2019	Dec. 26, 2018
Equity, Class of Treasury Stock [Line Items]
Purchase of treasury stock (in shares)		1,700
Purchase of treasury stock		$ 34,200,000	$ 12,807,000		$ 34,193,000	$ 50,804,000
Payments for repurchase of common stock					$ 36,008,000	$ 50,649,000
Treasury Stock
Equity, Class of Treasury Stock [Line Items]
Purchase of treasury stock (in shares)			589		1,690	2,632
Purchase of treasury stock			$ 12,807,000		$ 34,193,000	$ 50,804,000
Share Repurchase Program 2017
Equity, Class of Treasury Stock [Line Items]
Share repurchase, authorized amount		$ 200,000,000
Share Repurchase Program 2019
Equity, Class of Treasury Stock [Line Items]
Share repurchase, authorized amount							$ 250,000,000
Remaining shares to be repurchased					$ 248,000,000.0
Accelerated Share Repurchase 2018
Equity, Class of Treasury Stock [Line Items]
Purchase of treasury stock (in shares)	1,100
Purchase of treasury stock	$ 18,200,000
Share repurchase, authorized amount	25,000,000
Remaining shares to be repurchased								$ 6,800,000
Payments for repurchase of common stock	$ 25,000,000
Volume-weighted average price (in dollars per share)				$ 17.04
Accelerated Share Repurchase 2018 | Treasury Stock
Equity, Class of Treasury Stock [Line Items]
Purchase of treasury stock (in shares)				400		389
Purchase of treasury stock				$ 6,800,000