SIGNIFICANT ACCOUNTING POLICIES - Carrying Values and the Estimated Fair Values of Debt Instruments (Details) - USD ($) $ in Thousands	Jan. 31, 2019	Jan. 31, 2018
Level 2 | Senior secured term loan facility (the "Term Loan")
Debt Instrument [Line Items]
Debt instruments, carrying value	$ 300,000	$ 300,000
Debt instruments, fair value	300,000	300,000
Level 2 | Revolving credit facility
Debt Instrument [Line Items]
Debt instruments, carrying value		12,003
Debt instruments, fair value		12,003
Level 3 | LVMH Note
Debt Instrument [Line Items]
Debt instruments, carrying value	96,618	91,667
Debt instruments, fair value	$ 88,608	$ 91,667