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SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Jan. 31, 2020
Accounting Policies [Abstract] |
Schedule of reconciliation between basic and diluted net income per share | The following table reconciles the numerators and denominators used in the calculation of basic and diluted net income per share: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended January 31,
​ |  | 2020 |  | 2019 |  | 2018
​ | ​ | (In thousands, except per share amounts)
Net income | ​ | $ | 143,837 | ​ | $ | 138,067 | ​ | $ | 62,124
Basic net income per share: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic common shares | ​ | ​ | 48,209 | ​ | ​ | 49,140 | ​ | ​ | 48,820
Basic net income per share | ​ | $ | 2.98 | ​ | $ | 2.81 | ​ | $ | 1.27
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Diluted net income per share: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic common shares | ​ | ​ | 48,209 | ​ | ​ | 49,140 | ​ | ​ | 48,820
Dilutive restricted stock awards and stock options | ​ | ​ | 686 | ​ | ​ | 1,134 | ​ | ​ | 930
Diluted common shares | ​ | ​ | 48,895 | ​ | ​ | 50,274 | ​ | ​ | 49,750
Diluted net income per share | ​ | $ | 2.94 | ​ | $ | 2.75 | ​ | $ | 1.25
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] | ​ The following table summarizes the carrying values and the estimated fair values of the Company’s debt instruments: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Carrying Value | ​ | Fair Value
​ | ​ | ​ |  | January 31, | ​ | January 31, |  | January 31, | ​ | January 31,
Financial Instrument | ​ | Level | ​ | 2020 | ​ | 2019 | ​ | 2020 | ​ | 2019
​ | ​ | ​ | ​ | (In thousands)
Term loan | ​ | 2 | ​ | $ | 300,000 | ​ | $ | 300,000 | ​ | $ | 300,000 | ​ | $ | 300,000
Revolving credit facility | ​ | 2 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Note issued to LVMH | ​ | 3 | ​ | ​ | 102,009 | ​ | ​ | 96,618 | ​ | ​ | 95,126 | ​ | ​ | 88,608
Unsecured loan | ​ | 2 | ​ | ​ | 2,860 | ​ | ​ | — | ​ | ​ | 2,860 | ​ | ​ | —

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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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