Summary of Significant Accounting Policies (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares	Oct. 01, 2017 USD ($) $ / shares	Jul. 02, 2017 USD ($) $ / shares	Apr. 02, 2017 USD ($) $ / shares	Dec. 25, 2016 USD ($) $ / shares	Sep. 25, 2016 USD ($) $ / shares	Jun. 26, 2016 USD ($) $ / shares	Mar. 27, 2016 USD ($) $ / shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 25, 2016 USD ($) $ / shares shares	Dec. 27, 2015 USD ($) $ / shares shares	Sep. 23, 2014	Oct. 31, 2009
Long-lived assets [Line Items]
Equity method ownership percentage												40.00%	50.00%
Shipping and handling expense									$ 190,999	$ 180,270	$ 159,854
Options excluded from calculation of diluted earnings per share (in shares) | shares									499	277	0
Earnings per share, basic [Abstract]
Net earnings attributable to Hasbro, Inc.	$ (5,298)	$ 265,583	$ 67,723	$ 68,599	$ 192,725	$ 257,798	$ 52,106	$ 48,751	$ 396,607	$ 551,380	$ 451,838
Average shares outstanding (in shares) | shares									125,039	125,292	125,006
Net earnings per share, basic (in dollars per share) | $ / shares	$ (0.04)	$ 2.12	$ 0.54	$ 0.55	$ 1.54	$ 2.05	$ 0.42	$ 0.39	$ 3.17	$ 4.4	$ 3.61
Earnings per share, diluted [Abstract]
Net earnings attributable to Hasbro, Inc.	$ (5,298)	$ 265,583	$ 67,723	$ 68,599	$ 192,725	$ 257,798	$ 52,106	$ 48,751	$ 396,607	$ 551,380	$ 451,838
Average shares outstanding (in shares) | shares									125,039	125,292	125,006
Effect of dilutive securities: [Abstract]
Options and other share-based awards (in shares) | shares									1,992	1,674	1,682
Equivalent shares (in shares) | shares									127,031	126,966	126,688
Net earnings per share, diluted (in dollars per share) | $ / shares	$ (0.04)	$ 2.09	$ 0.53	$ 0.54	$ 1.52	$ 2.03	$ 0.41	$ 0.38	$ 3.12	$ 4.34	$ 3.57
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Payments related to tax withholding for share based compensation									$ 31,994	$ 21,969	$ 4,693
Retained Earnings [Member]
Earnings per share, basic [Abstract]
Net earnings attributable to Hasbro, Inc.									396,607	551,380	451,838
Earnings per share, diluted [Abstract]
Net earnings attributable to Hasbro, Inc.									$ 396,607	551,380	451,838
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									20 years
Joint Venture [Member]
Long-lived assets [Line Items]
Equity method ownership percentage	40.00%								40.00%
Number of significant equity method investments									1
Joint Venture [Member] | Minimum [Member]
Long-lived assets [Line Items]
Equity method ownership percentage	20.00%								20.00%
Joint Venture [Member] | Maximum [Member]
Long-lived assets [Line Items]
Equity method ownership percentage	50.00%								50.00%
Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Excess tax benefit from share based compensation, operating activities									$ 32,116
Payments related to tax withholding for share based compensation									$ 31,994	21,969	4,693
Restatement Adjustment [Member] | Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Excess tax benefit from share-based compensation										$ 20,471	$ 14,228
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