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INTANGIBLE ASSETS: - Estimated future amortization expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Mar. 31, 2021
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2022 $ 9,301  
2023 16,123  
2024 6,021  
2025 2,525  
Total finite-lived intangible assets, net $ 33,970 $ 39,730