Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Apr. 30, 2019	Jan. 31, 2019	Apr. 30, 2018
Level 2 | Senior secured term loan facility (the "Term Loan")
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	22,509		67,377
Debt instruments, fair value	22,509		67,377
Level 3 | LVMH Note
Debt Instrument [Line Items]
Debt instruments, carrying value	97,938	96,618	92,860
Debt instruments, fair value	$ 90,065	$ 88,608	$ 85,000