Business Combinations (Details) € in Thousands	1 Months Ended		3 Months Ended	6 Months Ended	12 Months Ended
	Jan. 31, 2019 EUR (€)	Jan. 31, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Jan. 04, 2019 EUR (€)	Jan. 04, 2019 USD ($)
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities, Net					$ 77,079,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities, Valuation Allowance					8,281,000
Operating lease right-of-use assets			$ 189,381,000		160,098,000
Goodwill			55,579,000		203,743,000
Operating lease liabilities			200,865,000
Jack Wolfskin
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	€ 457,394	$ 521,201,000
Cash Acquired						€ 50,984,000	$ 58,096,000
Business Combination, Acquisition Related Costs					$ 9,987,000
Gain (loss) recorded upon settlement of foreign currency forward contract				$ (3,215,000)
Accounts receivable							26,637,000
Inventories							94,504,000
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Income Tax Receivables							6,588,000
Other current assets							11,483,000
Property and equipment							20,930,000
Operating lease right-of-use assets							120,865,000
Deferred tax assets							2,930,000
Other assets							23,000
Goodwill			150,180,000
Total assets acquired							770,274,000
Accounts Payable and accrued liabilities							46,124,000
Income taxes payable, long-term							2,416,000
Operating lease liabilities							120,524,000
Deferred tax liabilities							80,009,000
Net assets acquired							521,201,000
Jack Wolfskin | General and Administrative Expense
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs			$ 0	$ 4,723,000
Customer Relationships
Business Acquisition [Line Items]
Useful Life (years)	10 years	10 years
Franchisee & Distributor Relationships | Jack Wolfskin
Business Acquisition [Line Items]
Intangibles - retail partners & distributor relationships							38,743,000
Trade Names | Jack Wolfskin
Business Acquisition [Line Items]
Intangibles - trade name(1)							$ 239,295,000
Royalty Rate | Royalty Savings Income Approach Method | Jack Wolfskin
Business Acquisition [Line Items]
Business Combination, Assumed Indefinite Lived Intangible Assets, Measurement Input						0.050	0.050
Discount Rate | Royalty Savings Income Approach Method | Jack Wolfskin
Business Acquisition [Line Items]
Business Combination, Assumed Indefinite Lived Intangible Assets, Measurement Input						0.100	0.100
Term Loan Facility | Secured Debt
Business Acquisition [Line Items]
Convertible Debt, Face Amount		$ 480,000,000