Reorganization and Reorganization Costs IT Realignment Costs (Details) - USD ($) $ in Thousands	3 Months Ended					12 Months Ended
	Dec. 29, 2019	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Restructuring Cost and Reserve
Reorganization and realignment costs	$ 12,194	$ 2,377	$ 941	$ 3,124	$ 2,626	$ 16,965	$ 9,068	$ 22,574
IT Realignment
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost Remaining	5,500					5,500
Restructuring and Related Cost, Incurred Cost						8,934
Reorganization and realignment costs						9,127	$ 0	$ 0
Severance and related employee costs | IT Realignment
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost Remaining	1,000					1,000
Restructuring and Related Cost, Incurred Cost						7,548
Third-party and other costs | IT Realignment
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost Remaining	4,500					4,500
Restructuring and Related Cost, Incurred Cost						1,386
Share-based compensation | IT Realignment
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost						193
Minimum | IT Realignment
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost	13,000					13,000
Maximum | IT Realignment
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost	$ 15,000					$ 15,000