BUSINESS COMBINATIONS BUSINESS COMBINATIONS - YEAR ENDED JANUARY 31, 2018 - INTANGIBLE ASSETS USEFUL LIVES (Details)
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3 Months Ended |
12 Months Ended |
Apr. 30, 2018 |
Jan. 31, 2018 |
| Individually Insignificant Business Combinations - Year Ended January 31, 2018 |
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|
| Business Acquisition [Line Items] |
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| Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |
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6 years 4 months
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| Minimum | Customer Relationships | Individually Insignificant Business Combinations - Year Ended January 31, 2018 |
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|
| Business Acquisition [Line Items] |
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|
| Finite-Lived Intangible Asset, Useful Life |
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2 years
|
| Minimum | Developed Technology | Individually Insignificant Business Combinations - Year Ended January 31, 2018 |
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|
| Business Acquisition [Line Items] |
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|
| Finite-Lived Intangible Asset, Useful Life |
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3 years
|
| Minimum | Trademarks and Trade Names | Individually Insignificant Business Combinations - Year Ended January 31, 2018 |
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|
| Business Acquisition [Line Items] |
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|
| Finite-Lived Intangible Asset, Useful Life |
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1 year
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| Maximum |
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|
| Business Acquisition [Line Items] |
|
|
| Finite-Lived Intangible Asset, Useful Life |
10 years
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|
| Maximum | Customer Relationships | Individually Insignificant Business Combinations - Year Ended January 31, 2018 |
|
|
| Business Acquisition [Line Items] |
|
|
| Finite-Lived Intangible Asset, Useful Life |
|
10 years
|
| Maximum | Developed Technology | Individually Insignificant Business Combinations - Year Ended January 31, 2018 |
|
|
| Business Acquisition [Line Items] |
|
|
| Finite-Lived Intangible Asset, Useful Life |
|
5 years
|
| Maximum | Trademarks and Trade Names | Individually Insignificant Business Combinations - Year Ended January 31, 2018 |
|
|
| Business Acquisition [Line Items] |
|
|
| Finite-Lived Intangible Asset, Useful Life |
|
7 years
|