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INTANGIBLE ASSETS: (Tables)
 6 Months Ended
Sep. 30, 2020
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, 2020March 31, 2020
Developed technology, gross$67,507 $66,451 
Accumulated amortization(57,678)(54,713)
Net developed technology$9,829 $11,738 
Customer relationship/Trade name, gross$43,101 $42,993 
Accumulated amortization(35,816)(33,109)
Net customer/trade name$7,285 $9,884 
Publisher/Data supply relationships, gross$39,800 $39,800 
Accumulated amortization(20,205)(16,222)
Net publisher relationship$19,595 $23,578 
Total intangible assets, gross$150,408 $149,244 
Total accumulated amortization(113,699)(104,044)
Total intangible assets, net$36,709 $45,200 
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 2021 represents the remaining six months ending March 31, 2021 (dollars in thousands): 
Fiscal Year:
2021$8,031 
202214,458 
202312,050 
20242,170 
$36,709