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LEASES: Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease costs $ 11,600 $ 11,600 $ 10,100
Lease period extensions 7 years    
Operating lease assets obtained in exchange for operating lease liabilities $ 56,182 $ 372 $ 2,707
Fiscal 2023 9,308    
Fiscal 2024 11,079    
Fiscal 2025 9,700    
Fiscal 2026 10,260    
Leased office facilities      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Fiscal 2023 2,663    
Fiscal 2024 2,698    
Fiscal 2025 2,698    
Fiscal 2026 $ 1,799    
Minimum      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Lease period extensions 2 years    
Maximum      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Lease period extensions 8 years