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Fair Value of Financial Instruments (Tables)
6 Months Ended
Jul. 31, 2018
Fair Value Disclosures [Abstract]  
Schedule of carrying values and estimated fair values of debt instruments
        Carrying Value     Fair Value  
Financial Instrument   Level   7/31/2018     1/31/2018     7/31/2018     1/31/2018  
        (in thousands)  
Term Loan   2   $ 300,000     $ 300,000     $ 300,000     $ 300,000  
Revolving credit facility   2   $ 111,426     $ 12,003     $ 111,426     $ 12,003  
LVMH Note   3   $ 94,100     $ 91,667     $ 85,000     $ 85,000