Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jul. 31, 2019	Jan. 31, 2019	Jul. 31, 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	160,000		111,426
Debt instruments, fair value	160,000		111,426
Level 2 | Unsecured Loan
Debt Instrument [Line Items]
Debt instruments, carrying value	3,243
Debt instruments, fair value	3,243
Level 3 | LVMH Note
Debt Instrument [Line Items]
Debt instruments, carrying value	99,266	96,618	94,100
Debt instruments, fair value	$ 96,437	$ 88,608	$ 85,000