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Acquisitions (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |
Business Combination, Contingent Consideration, Liability | $ 1,420 |  | $ 9,124 | $ 3,000
Payments to Acquire Businesses, Net of Cash Acquired | 0 | $ 36,753 |  |
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value | $ 298 | $ (1,425) |  |
Greats Brand Inc. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 20 years |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  | 90.00% |
Payments to Acquire Businesses, Gross |  |  | $ 12,829 |
Business Combination, Contingent Consideration, Liability | $ 670 |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | 14,209 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  |  | 290 |
Business Combination, Acquired Receivable, Fair Value |  |  | 41 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory |  |  | 1,387 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets |  |  | 6,447 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  | 200 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  |  | (1,963) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities |  |  | (1,055) |
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value |  |  | (1,611) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |  | 14,499 |
shoo:FutureContingentPayment |  |  | 5,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities |  |  | $ (3,463) |
B. B. Dakota, Inc. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 10 years |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  | 100.00% |
Payments to Acquire Businesses, Gross |  |  | $ 24,568 |
Business Combination, Contingent Consideration, Liability | $ 750 |  | 4,770 |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | 29,404 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  |  | 353 |
Business Combination, Acquired Receivable, Fair Value |  |  | 4,419 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory |  |  | 6,696 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets |  |  | 855 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  | 382 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  |  | (2,885) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities |  |  | (2,893) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |  | 16,392 |
Goodwill – net |  |  | 13,365 |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  | 29,757 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities |  |  | (2,735) |
Customer Relationships [Member] | Greats Brand Inc. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | 1,140 |
Customer Relationships [Member] | B. B. Dakota, Inc. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | 2,530 |
Trademarks [Member] | Greats Brand Inc. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Indefinite-lived Intangible Assets Acquired |  |  | 13,086 |
Trademarks [Member] | B. B. Dakota, Inc. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Indefinite-lived Intangible Assets Acquired |  |  | $ 9,670 |

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