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Summary of Significant Accounting Policies - Revenue Recognition/Advertising Costs/Equity Method Investments (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Mar. 31, 2020 | Mar. 02, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Contract liability | $ 62,000,000.0 | $ 58,400,000 | $ 62,000,000.0 | $ 58,400,000 | $ 60,400,000 |  |
Revenue recognized | 11,300,000 | 13,400,000 | 31,600,000 | 32,600,000 |  |  |
Shipping and handling costs | 21,700,000 | 20,500,000 | 36,500,000 | 42,200,000 |  |  |
Loss from equity method investments | 179,000 | 4,491,000 | 5,707,000 | 4,237,000 |  |  |
Net revenues | $ 707,640,000 | 1,191,729,000 | $ 1,637,880,000 | 2,396,451,000 |  |  |
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 | 48,600,000 | 0 | 48,600,000 | 5,100,000 |  |
Loss from equity method investments | 0 | 4,500,000 | 1,400,000 | 4,200,000 |  |  |
Dome Corporation | Licensing Receivable |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Accounts receivable, net | 3,200,000 | 5,200,000 | 3,200,000 | 5,200,000 | 15,600,000 |  |
Dome Corporation | License |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Net revenues |  | $ 5,200,000 | 6,700,000 | 11,700,000 |  |  |
UA Sports (Thailand) Co., Ltd |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  | 49.50%
Investment | 5,000,000.0 |  | 5,000,000.0 |  |  |  |
Loss from equity method investments | $ 200,000 |  | 600,000 |  |  |  |
Customer Refund Liability |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Reserves for customer returns allowances markdowns and discounts |  |  | 199,000,000.0 | 241,500,000 | 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 |  |  | $ 59,700,000 | $ 68,600,000 | $ 61,100,000 |  |

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