Quarterly Financial Data (Unaudited – see accompanying accountants’ report) - Additional Information (Details) - USD ($)	3 Months Ended						12 Months Ended
	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2019	Dec. 30, 2018	Sep. 30, 2018	Apr. 01, 2018	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Quarterly Financial Data [Line Items]
Settlement of U.S. defined benefit plan, before tax	$ 185,000		$ 110,777,000
Settlement of U.S. defined benefit plan	143,000		$ 85,852,000				$ 85,995,000	$ 0	$ 0
Gain on acquisition	101,249,000
Gain on acquisition, net	102,658,000
Deferred financing fees paid	(20,568,000)						(26,653,000)	0	0
Transaction costs, tax expense (benefit)	1,409,000
Bad debt expense				$ (10,068,000)		$ 70,428,000		49,000,000	18,000,000
Bad debt expense, net				(8,543,000)		61,372,000
Severance charges	72,000,000			72,000,000		17,349,000	69,192,000	89,349,000
Severance charges, net				62,249,000		15,699,000
Impairment of goodwill				86,253,000			0	86,253,000	0
Impairment of intangible assets	0			31,303,000			0	$ 31,303,000	$ 0
Goodwill and intangible asset impairment				96,928,000
Tax Act, expense (benefit)				$ (10,196,000)	$ 17,336,000	$ (47,790,000)
eOne Acquisition
Quarterly Financial Data [Line Items]
Acquisition costs	17,778,000						17,778,000
Other Operating Income (Expense) | Not designated as hedging instrument | Foreign exchange contract | eOne Acquisition
Quarterly Financial Data [Line Items]
Other (income) expense	$ 139,666,000	$ 25,533,000					$ (79,990,000)
Gain (loss) on derivative, net		$ 20,886,000