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Subsequent Event	3 Months Ended
	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event Margaret H. Georgiadis, Mattel's current Chief Executive Officer (“CEO”), notified the Board of Directors (the “Board”) of her intention to resign from her role as CEO and as a director of the Board, effective on April 26, 2018 (the “Transition Date”). On April 17, 2018, Ynon Kreiz was appointed as CEO of Mattel, effective as of the Transition Date.  Ms. Georgiadis will serve as an Executive Advisor to the CEO of Mattel until May 10, 2018.

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The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

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