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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 |  |  |  |

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