Summary of Significant Accounting Policies (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 30, 2018 USD ($) $ / shares	Sep. 30, 2018 USD ($) $ / shares	Jul. 01, 2018 USD ($) $ / shares	Apr. 01, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($) $ / shares	Oct. 01, 2017 USD ($) $ / shares	Jul. 02, 2017 USD ($) $ / shares	Apr. 02, 2017 USD ($) $ / shares	Dec. 30, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 25, 2016 USD ($) $ / shares shares	Sep. 23, 2014	Oct. 31, 2009
Long-lived assets [Line Items]
Cost of sales									$ 1,850,678	$ 2,033,693	$ 1,905,474
Options excluded from calculation of diluted earnings per share (in shares) | shares									1,077	499	277
Selling, distribution and administration									$ 1,287,560	$ 1,124,793	$ 1,110,769
Earnings per share, basic [Abstract]
Net earnings attributable to Hasbro, Inc.	$ 8,766	$ 263,861	$ 60,299	$ (112,492)	$ (5,298)	$ 265,583	$ 67,723	$ 68,599	$ 220,434	$ 396,607	$ 551,380
Average shares outstanding (in shares) | shares									126,132	125,039	125,292
Net earnings per share, basic (in dollars per share) | $ / shares	$ 0.07	$ 2.08	$ 0.48	$ (0.9)	$ (0.04)	$ 2.12	$ 0.54	$ 0.55	$ 1.75	$ 3.17	$ 4.4
Earnings per share, diluted [Abstract]
Net earnings attributable to Hasbro, Inc.	$ 8,766	$ 263,861	$ 60,299	$ (112,492)	$ (5,298)	$ 265,583	$ 67,723	$ 68,599	$ 220,434	$ 396,607	$ 551,380
Average shares outstanding (in shares) | shares									126,132	125,039	125,292
Effect of dilutive securities: [Abstract]
Options and other share-based awards (in shares) | shares									758	1,992	1,674
Equivalent shares (in shares) | shares									126,890	127,031	126,966
Net earnings per share, diluted (in dollars per share) | $ / shares	$ 0.07	$ 2.06	$ 0.48	$ (0.9)	$ (0.04)	$ 2.09	$ 0.53	$ 0.54	$ 1.74	$ 3.12	$ 4.34
Asset Impairment Charges Abstract
Impairment of goodwill									$ (86,253)	$ 0	$ (32,858)
Impairment of intangible assets, finite-lived									(31,303)	$ 0	$ 0
Noncontrolling Interest Abstract
Noncontrolling Interest, Remaining Ownership Percentage Acquired by Parent										30.00%
Minority Interest Ownership Percentage By Parent											70.00%
Minority Interest Ownership Percentage By Noncontrolling Owners											30.00%
Acquired interest in joint venture, Discovery Family Channel												40.00%	50.00%
Shipping And Handling [Member]
Long-lived assets [Line Items]
Selling, distribution and administration									206,307	$ 190,999	$ 180,270
Retained Earnings [Member]
Earnings per share, basic [Abstract]
Net earnings attributable to Hasbro, Inc.									220,434	396,607	551,380
Earnings per share, diluted [Abstract]
Net earnings attributable to Hasbro, Inc.									$ 220,434	396,607	$ 551,380
Minimum [Member]
Long-lived assets [Line Items]
Finite-lived intangible assets, useful life									4 years
Maximum [Member]
Long-lived assets [Line Items]
Finite-lived intangible assets, useful life									25 years
Joint Venture [Member]
Long-lived assets [Line Items]
Number of significant equity method investments									1
Noncontrolling Interest Abstract
Acquired interest in joint venture, Discovery Family Channel	40.00%								40.00%
Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Excess tax benefit from share-based compensation									$ 10,757	32,116
Accounting Standards Update 2016-09 [Member] | Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New accounting pronouncement or change in accounting principle cumulative effect of change on equity or net assets					$ 700					$ 700
Accounting Standards Update 2018-02 [Member] | Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New accounting pronouncement or change in accounting principle cumulative effect of change on equity or net assets	$ 21,503								$ 21,503
Percentage of Revenues from Sales of Finished Products [Member]
Long-lived assets [Line Items]
Percentage of revenues from sales of finished products									92.00%	94.00%
Land and Improvements [Member] | Minimum [Member]
Long-lived assets [Line Items]
Depreciation period									15 years
Land and Improvements [Member] | Maximum [Member]
Long-lived assets [Line Items]
Depreciation period									19 years
Buildings and Improvements [Member] | Minimum [Member]
Long-lived assets [Line Items]
Depreciation period									15 years
Buildings and Improvements [Member] | Maximum [Member]
Long-lived assets [Line Items]
Depreciation period									25 years
Machinery and Equipment [Member] | Minimum [Member]
Long-lived assets [Line Items]
Depreciation period									3 years
Machinery and Equipment [Member] | Maximum [Member]
Long-lived assets [Line Items]
Depreciation period									12 years
Tools, Dies and Molds [Member] | Maximum [Member]
Long-lived assets [Line Items]
Depreciation period									3 years