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Notes Payable - Long-term debt (Details) - USD ($) $ in Thousands	Oct. 31, 2020	Aug. 06, 2020	Jan. 31, 2020	Oct. 31, 2019
Debt Instrument [Line Items]
Total	$ 504,328		$ 396,794	$ 674,741
Long-term Debt
Debt Instrument [Line Items]
Subtotal	535,117		427,860	707,828
Less: Net debt issuance costs (1)	(8,067)		(7,402)	(8,055)
Debt discount	(18,639)		(22,991)	(24,377)
Current portion of long-term debt	(4,083)		(673)	(655)
Secured notes
Debt Instrument [Line Items]
Subtotal	300,000
Debt issuance costs	8,500
Secured notes \| Long-term Debt
Debt Instrument [Line Items]
Subtotal	400,000
Term Loan
Debt Instrument [Line Items]
Total		$ 300,000
Term Loan \| Long-term Debt
Debt Instrument [Line Items]
Subtotal			300,000	300,000
Revolving credit facility
Debt Instrument [Line Items]
Debt issuance costs	7,300		4,600	5,200
Revolving credit facility \| Long-term Debt
Debt Instrument [Line Items]
Subtotal				279,880
LVMH Note
Debt Instrument [Line Items]
Debt discount	(40,000)
LVMH Note \| Long-term Debt
Debt Instrument [Line Items]
Subtotal	125,000		125,000	125,000
Unsecured Loan \| Long-term Debt
Debt Instrument [Line Items]
Subtotal	7,232		$ 2,860	$ 2,948
Overdraft facilities \| Long-term Debt
Debt Instrument [Line Items]
Subtotal	$ 2,885