Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jul. 31, 2020	Jan. 31, 2020	Jul. 31, 2019
Secured notes
Debt Instrument [Line Items]
Debt instruments, carrying value	$ 300,000
Level 2 | Secured notes
Debt Instrument [Line Items]
Debt instruments, carrying value	300,000	$ 300,000	$ 300,000
Debt instruments, fair value	300,000	300,000	300,000
Level 2 | Revolving credit facility
Debt Instrument [Line Items]
Debt instruments, carrying value			160,000
Debt instruments, fair value			160,000
Level 2 | Unsecured Loan
Debt Instrument [Line Items]
Debt instruments, carrying value	6,401	2,860	3,243
Debt instruments, fair value	6,401	2,860	3,243
Level 2 | Overdraft facilities
Debt Instrument [Line Items]
Debt instruments, carrying value	3,530
Debt instruments, fair value	3,530
Level 3 | LVMH Note
Debt Instrument [Line Items]
Debt instruments, carrying value	104,884	102,009	99,266
Debt instruments, fair value	$ 102,304	$ 95,126	$ 96,437