Reorganization and Reorganization Costs G&A Realignment Costs (Details) $ in Thousands	3 Months Ended					12 Months Ended
	Dec. 29, 2019 USD ($)	Dec. 30, 2018 USD ($) Pension_Plans	Sep. 30, 2018 USD ($)	Jul. 01, 2018 USD ($)	Apr. 01, 2018 USD ($)	Dec. 29, 2019 USD ($)	Dec. 30, 2018 USD ($) Pension_Plans	Dec. 31, 2017 USD ($)
Restructuring Cost and Reserve
Reorganization and realignment costs	$ 12,194	$ 2,377	$ 941	$ 3,124	$ 2,626	$ 16,965	$ 9,068	$ 22,574
G&A Realignment
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost						6,535	5,893	16,536
Restructuring and Related Cost, Cost Incurred to Date	28,964					28,964
Reorganization and realignment costs						7,749	8,785	21,663
Restructuring Charges, Incurred to Date	38,197					38,197
Severance and related employee costs | G&A Realignment
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost						5,485	3,797	14,956
Restructuring and Related Cost, Cost Incurred to Date	24,238					24,238
Recruitment and relocation costs | G&A Realignment
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost						950	1,077	489
Restructuring and Related Cost, Cost Incurred to Date	2,516					2,516
Third-party and other costs | G&A Realignment
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost						100	1,019	1,091
Restructuring and Related Cost, Cost Incurred to Date	2,210					2,210
Share-based compensation | G&A Realignment
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost						1,214	1,557	5,127
Restructuring and Related Cost, Cost Incurred to Date	7,898					7,898
Termination of defined benefit plans | G&A Realignment
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost						0	$ 1,335	$ 0
Restructuring and Related Cost, Cost Incurred to Date	$ 1,335					$ 1,335
Pension Plans, Defined Benefit
Restructuring Cost and Reserve
Defined Benefit Plans, Number of Plans | Pension_Plans		2					2