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INTANGIBLE ASSETS: (Tables)
 6 Months Ended
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of amortization activity of intangible assets The following table shows the amortization activity of intangible assets (dollars in thousands):
September 30, 2021March 31, 2021
Developed technology, gross$82,018 $78,547 
Accumulated amortization(64,065)(60,424)
Net developed technology$17,953 $18,123 
Customer relationship/Trade name, gross$43,503 $43,506 
Accumulated amortization(39,114)(37,510)
Net customer/trade name$4,389 $5,996 
Publisher/Data supply relationships, gross$39,800 $39,800 
Accumulated amortization(28,172)(24,189)
Net publisher relationship$11,628 $15,611 
Total intangible assets, gross$165,321 $161,853 
Total accumulated amortization(131,351)(122,123)
Total intangible assets, net$33,970 $39,730 
Schedule of estimated future amortization expenses related to purchases and other intangible assets
The following table presents the estimated future amortization expenses related to purchased intangible assets. The amount for 2022 represents the remaining six months ending March 31, 2022 (dollars in thousands): 

Fiscal Year:
2022$9,301 
202316,123 
20246,021 
20252,525 
$33,970