Segment Reporting - Information and Reconciliation by Segment (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 28, 2021 segment	Dec. 26, 2021 USD ($)	Dec. 27, 2020 USD ($)	Dec. 29, 2019 USD ($)
Segment Reporting [Abstract]
Number of reporting segments | segment	3
Segment Reporting Information [Line Items]
Revenues from External Customers		$ 6,420.4	$ 5,465.4	$ 4,720.2
Affiliate Revenue		0.0	0.0	0.0
Operating Profit (Loss)		763.3	501.8	652.1
Depreciation and Amortization		280.1	265.0	180.8
Capital Additions		132.7	125.8	133.6
Total Assets		10,037.8	10,818.4	8,855.6
Corporate and eliminations
Segment Reporting Information [Line Items]
Revenues from External Customers		0.0	0.0	0.0
Affiliate Revenue		(648.5)	(462.2)	(452.5)
Operating Profit (Loss)		(93.3)	(85.6)	36.9
Depreciation and Amortization		22.6	39.7	76.1
Capital Additions		18.3	14.0	23.7
Total Assets		(2,525.6)	(1,322.8)	2,515.1
Consumer Products | Operating Segments
Segment Reporting Information [Line Items]
Revenues from External Customers		3,981.6	3,649.6	3,881.2
Affiliate Revenue		465.4	379.0	386.0
Operating Profit (Loss)		401.4	308.1	306.9
Depreciation and Amortization		112.4	78.3	92.7
Capital Additions		73.1	69.3	78.2
Total Assets		4,925.5	5,552.5	5,388.9
Wizards of the Coast and Digital Gaming | Operating Segments
Segment Reporting Information [Line Items]
Revenues from External Customers		1,286.6	906.7	761.2
Affiliate Revenue		121.6	77.3	55.0
Operating Profit (Loss)		547.0	420.4	294.7
Depreciation and Amortization		48.5	9.0	9.2
Capital Additions		35.1	35.9	31.1
Total Assets		1,585.1	585.7	613.1
Entertainment
Segment Reporting Information [Line Items]
Revenues from External Customers		1,152.2	909.1	77.8
Entertainment | Operating Segments
Segment Reporting Information [Line Items]
Revenues from External Customers		1,152.2	909.1	77.8
Affiliate Revenue		61.5	5.9	11.5
Operating Profit (Loss)		(91.8)	(141.1)	13.6
Depreciation and Amortization		96.6	138.0	2.8
Capital Additions		6.2	6.6	0.6
Total Assets		$ 6,052.8	$ 6,003.0	$ 338.5