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Basis of Presentation	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited consolidated financial statements and related disclosures have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") applicable to interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. In the opinion of management, all adjustments, consisting of only those of a normal recurring nature, considered necessary for a fair statement of the financial position and interim results of Mattel, Inc. and its subsidiaries ("Mattel") as of and for the periods presented have been included. Mattel adopted Accounting Standards Update ("ASU") No. 2016-02—Leases (Topic 842) and its related amendments (collectively "the new lease standard") on January 1, 2019 using the modified retrospective transition method. Prior periods were not retrospectively adjusted and continue to be reported under the accounting standards in effect for those periods, as further discussed in "Note 5 to the Consolidated Financial Statements—Leases." Mattel modified its reporting structure for revenues and reorganized its regional sales reporting structure in the first quarter of 2019. Prior period amounts have been reclassified to conform to the current period presentation, as further discussed in "Note 23 to the Consolidated Financial Statements—Segment Information." The December 31, 2018 balance sheet data was derived from audited financial statements; however, the accompanying interim notes to the consolidated financial statements do not include all the annual disclosures required by GAAP. As Mattel’s business is seasonal, results for interim periods are not necessarily indicative of those that may be expected for a full year. The financial information included herein should be read in conjunction with Mattel’s consolidated financial statements and related notes in its 2018 Annual Report on Form 10-K.

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- Definition

The entire disclosure for the basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-URI http://asc.fasb.org/topic&trid=2122369

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