Description of Business and Basis of Presentation	3 Months Ended
Description of Business and Basis of Presentation	Mar. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION	DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION Business Under Armour, Inc. (together with its wholly owned subsidiaries, the "Company") is a developer, marketer and distributor of branded athletic performance apparel, footwear and accessories. The Company creates products engineered to make athletes better with a vision to inspire performance solutions you never knew you needed and can't imagine living without. The Company's products are made, sold and worn worldwide. Basis of Presentation The accompanying unaudited Condensed Consolidated Financial Statements are presented in U.S. Dollars and include the accounts of Under Armour, Inc. and its wholly owned subsidiaries. Certain information in footnote disclosures normally included in annual financial statements were condensed or omitted for the interim periods presented in accordance with the rules and regulations of the Securities and Exchange Commission (the "SEC") and accounting principles generally accepted in the United States of America ("U.S. GAAP") for interim consolidated financial statements. In the opinion of management, all adjustments consisting of normal, recurring adjustments considered necessary for a fair statement of the financial position and results of operations were included. Intercompany balances and transactions were eliminated upon consolidation. The unaudited Condensed Consolidated Balance Sheet as of March 31, 2022 is derived from the audited financial statements included in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2021 ("Fiscal 2021"), filed with the SEC on February 23, 2022 ("Annual Report on Form 10-K for Fiscal 2021"), which should be read in conjunction with these unaudited Condensed Consolidated Financial Statements. The unaudited results for the three months ended March 31, 2022, are not necessarily indicative of the results to be expected for the fiscal year beginning April 1, 2022 and ending March 31, 2023 ("Fiscal 2023"), or any other portions thereof. Fiscal Year End Change As previously disclosed, in the first quarter of Fiscal 2021, the Company's Board of Directors approved a change in the Company's fiscal year end from December 31 to March 31, effective for the fiscal year beginning April 1, 2022. As a result of the change in fiscal year end, this document reflects the Company's Transition Report on Form 10-Q for the period from January 1, 2022 through March 31, 2022. The Company's next fiscal year will run from April 1, 2022 through March 31, 2023 (Fiscal 2023). Consequently, there will be no Fiscal 2022. Due to the change in fiscal year end, the income tax provision for the three months ended March 31, 2022 was calculated using actual tax rates for the period. The provision for income taxes for the comparative three months ended March 31, 2021 was computed using the estimated effective tax rate applicable to Fiscal 2021. Management Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates, judgments, and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the Condensed Consolidated Financial Statements and the reported amounts of revenues and expenses during the reporting period. These estimates, judgments and assumptions are evaluated on an on-going basis. The Company bases its estimates on historical experience and on various other assumptions that it believes are reasonable at that time; however, actual results could differ from these estimates. The COVID-19 pandemic continues to significantly impact the global economy. As the impacts of major global events continue to evolve, estimates and assumptions about future events and their effects cannot be determined with certainty and therefore require increased judgment. The extent to which the evolving events impact the Company's financial statements will depend on a number of factors including, but not limited to, any new information that may emerge concerning the severity of these major events and the actions that governments around the world may take in response. While the Company believes it has made appropriate accounting estimates and assumptions based on the facts and circumstances available as of this reporting date, the Company may experience further impacts based on long-term effects on the Company's customers and the countries in which the Company operates. Please see the risk factors discussed in Part I, Item 1A "Risk Factors" of the Company's Annual Report on Form 10-K for Fiscal 2021.