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SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Jan. 31, 2018
Accounting Policies [Abstract] |
Schedule of numerators and denominators used in the calculation of basic and diluted net income per share |
|  |  | Year Ended January 31, |
|  |  | 2018 |  |  | 2017 |  |  | 2016 |
|  |  | (In thousands, except per share amounts) |
Net income |  |  |  | $ | 62,124 |  |  |  |  | $ | 51,938 |  |  |  |  | $ | 114,333 |  |
Basic net income per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic common shares |  |  |  |  | 48,820 |  |  |  |  |  | 46,308 |  |  |  |  |  | 45,328 |  |
Basic net income per share |  |  |  | $ | 1.27 |  |  |  |  | $ | 1.12 |  |  |  |  | $ | 2.52 |  |
Diluted net income per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic common shares |  |  |  |  | 48,820 |  |  |  |  |  | 46,308 |  |  |  |  |  | 45,328 |  |
Stock options and restricted stock unit awards |  |  |  |  | 930 |  |  |  |  |  | 1,086 |  |  |  |  |  | 1,184 |  |
Diluted common shares |  |  |  |  | 49,750 |  |  |  |  |  | 47,394 |  |  |  |  |  | 46,512 |  |
Diluted net income per share |  |  |  | $ | 1.25 |  |  |  |  | $ | 1.10 |  |  |  |  | $ | 2.46 |  |

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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://www.xbrl.org/2003/role/presentationRef -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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