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Summary of Significant Accounting Policies - Revenue Recognition/Advertising Costs/Equity Method Investments (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Mar. 31, 2020 | Mar. 02, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Contract liability | $ 64,900,000 |  | $ 60,600,000 | $ 64,900,000 | $ 60,600,000 | $ 60,400,000 |  |
Revenue recognized | 9,900,000 |  | 9,200,000 | 21,200,000 | 22,600,000 |  |  |
Shipping and handling costs | 21,200,000 |  | 20,800,000 | 61,200,000 | 63,000,000.0 |  |  |
Loss from equity method investments | 1,199,000 |  | 1,177,000 | 6,906,000 | 5,414,000 |  |  |
Net revenues | $ 1,433,021,000 |  | 1,429,456,000 | $ 3,070,901,000 | 3,825,907,000 |  |  |
Dome Corporation |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 29.50% |  |  | 29.50% |  |  |  |
Net assets exceeding investment value |  |  |  |  |  |  | $ 3,700,000 |
Impairment charge |  |  |  | $ 3,700,000 |  |  |  |
Investment | $ 0 |  | 47,400,000 | 0 | 47,400,000 | 5,100,000 |  |
Loss from equity method investments | 0 |  | 1,200,000 | 1,400,000 | 5,400,000 |  |  |
Dome Corporation | Licensing Receivable |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Accounts receivable, net | 8,500,000 |  | 9,100,000 | 8,500,000 | 9,100,000 | 15,600,000 |  |
Dome Corporation | License |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Net revenues | 10,900,000 | $ 3,000,000.0 | $ 9,200,000 | 17,400,000 | 20,900,000 |  |  |
UA Sports (Thailand) Co., Ltd |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  | 49.50%
Investment | 3,700,000 |  |  | 3,700,000 |  |  |  |
Loss from equity method investments | $ 1,200,000 |  |  | 1,800,000 |  |  |  |
Customer Refund Liability |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Reserves for customer returns allowances markdowns and discounts |  |  |  | 197,500,000 | 209,800,000 | 219,400,000 |  |
Prepaid Expenses and Other Current Assets |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Reserves for customer returns allowances markdowns and discounts |  |  |  | $ 50,800,000 | $ 58,700,000 | $ 61,100,000 |  |

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