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LEASES: Narrative (Details) - USD ($)
$ in Thousands
9 Months Ended
Dec. 31, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating lease costs $ 8,700 $ 7,500
Fiscal 2021 2,920  
Fiscal 2022 9,303  
Fiscal 2023 2,780  
Fiscal 2024 785  
Fiscal 2025 72  
Thereafter 0  
Leased office facilities    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Fiscal 2021 648  
Fiscal 2022 2,611  
Fiscal 2023 2,663  
Fiscal 2024 2,698  
Fiscal 2025 2,698  
Thereafter $ 1,799