FOREIGN OPERATIONS: (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 528,657	$ 443,026	$ 380,572
Long-lived assets	517,902	462,606
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	495,765	415,976	354,437
Long-lived assets	509,014	456,662
Group Of Foreign Countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	32,892	27,050	26,135
Long-lived assets	8,888	5,944
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	26,373	22,515	20,789
Long-lived assets	4,174	1,084
Asia-Pacific ("APAC")
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	6,519	4,535	$ 5,346
Long-lived assets	$ 4,714	$ 4,860