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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, 2018 | Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, gross | $ 113,600 | $ 113,600
Accumulated amortization | (78,685) | (69,072)
Total finite-lived intangible assets, net | 34,915 | 44,528
Developed technology, gross (Software) |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, gross | 54,000 | 54,000
Accumulated amortization | (48,054) | (43,383)
Total finite-lived intangible assets, net | 5,946 | 10,617
Trade name |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, gross | 35,800 | 35,800
Accumulated amortization | (23,359) | (20,400)
Total finite-lived intangible assets, net | 12,441 | 15,400
Publisher Relationship |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, gross | 23,800 | 23,800
Accumulated amortization | (7,272) | (5,289)
Total finite-lived intangible assets, net | $ 16,528 | $ 18,511
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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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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