Description of Business and Basis of Presentation - Adoption of New Accounting Pronouncements (Details) - USD ($) $ in Thousands	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 29, 2019	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity	$ (864,963)	$ (820,939)	$ (786,160)		$ (776,437)	$ (765,471)	$ (774,434)	$ (762,580)	$ (743,154)
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity	$ (107,801)	$ (72,512)	$ (116,345)		(107,132)	$ (103,212)	$ (102,020)	$ (91,763)	(74,840)
Cumulative effect of change in accounting principle
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity					529				506
Cumulative effect of change in accounting principle | ASU No. 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses				$ 700
Cumulative effect of change in accounting principle | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity					$ 529				$ 506
Cumulative effect of change in accounting principle | Retained Earnings | ASU No. 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity				$ 500