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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Mar. 02, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Contract liability | $ 24,300,000 | $ 64,900,000 | $ 24,300,000 | $ 64,900,000 | $ 26,700,000 |
Revenue recognized | 3,100,000 | 9,900,000 | 10,800,000 | 21,200,000 |  |
Shipping and handling costs | 13,800,000 | 21,200,000 | 63,300,000 | 61,200,000 |  |
Income (loss) from equity method investments | (921,000) | (1,199,000) | 969,000 | (6,906,000) |  |
Net revenues | $ 1,545,532,000 | 1,433,021,000 | $ 4,154,261,000 | 3,070,901,000 |  |
Dome Corporation |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Ownership percentage | 29.50% |  | 29.50% |  |  |
Income (loss) from equity method investments | $ 0 | 0 | $ 1,800,000 | (1,400,000) |  |
Investment | 1,800,000 | 0 | 1,800,000 | 0 | 0 |
Dome Corporation | Licensing Receivable |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Accounts receivable, net | 8,900,000 | 8,500,000 | 8,900,000 | 8,500,000 | 22,900,000 |
Dome Corporation | License |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Net revenues | 11,100,000 | 10,900,000 | 22,900,000 | 17,400,000 |  |
UA Sports (Thailand) Co., Ltd |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Ownership percentage |  |  |  |  |  | 49.50%
Income (loss) from equity method investments | (921,000) | 1,200,000 | (873,000) | 1,800,000 |  |
Investment | $ 4,700,000 | $ 3,700,000 | 4,700,000 | 3,700,000 | 4,500,000 |
Customer Refund Liability |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Reserves for customer returns allowances markdowns and discounts |  |  | 174,274,000 | 197,496,000 | 203,399,000 |
Inventory Associated with the Reserves |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Reserves for customer returns allowances markdowns and discounts |  |  | $ 50,544,000 | $ 50,779,000 | $ 57,867,000 |

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