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GOODWILL AND INTANGIBLE ASSETS: - Amounts allocated to intangible assets from acquisitions (Details) - USD ($) $ in Thousands | 6 Months Ended |
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Sep. 30, 2019 | Mar. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |
Developed technology, gross (Software) | $ 150,300 | $ 113,600
Accumulated amortization | (93,560) | (85,008)
Total finite-lived intangible assets, net | 56,740 | 28,592
Developed technology, gross (Software) |  |
Finite-Lived Intangible Assets [Line Items] |  |
Developed technology, gross (Software) | 78,500 | 54,000
Accumulated amortization | (52,633) | (49,625)
Total finite-lived intangible assets, net | 25,867 | 4,375
Trade name |  |
Finite-Lived Intangible Assets [Line Items] |  |
Developed technology, gross (Software) | 41,000 | 35,800
Accumulated amortization | (29,251) | (26,128)
Total finite-lived intangible assets, net | 11,749 | 9,672
Publisher Relationship |  |
Finite-Lived Intangible Assets [Line Items] |  |
Developed technology, gross (Software) | 30,800 | 23,800
Accumulated amortization | (11,676) | (9,255)
Total finite-lived intangible assets, net | $ 19,124 | $ 14,545
Minimum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortization period | 2 years |
Maximum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortization period | 6 years |

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