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FOREIGN OPERATIONS: (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues $ 443,026 $ 380,572 $ 285,620
Long-lived assets 462,606 405,818  
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 415,976 354,437 262,135
Long-lived assets 456,662 399,456  
Group Of Foreign Countries      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 27,050 26,135 23,485
Long-lived assets 5,944 6,362  
Europe      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 22,515 20,789 18,566
Long-lived assets 1,084 2,724  
Asia-Pacific ("APAC")      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 4,535 5,346 $ 4,919
Long-lived assets $ 4,860 $ 3,638