OTHER LIABILITIES: (Details) - USD ($)	Dec. 31, 2020	Mar. 31, 2020
Other Liabilities Disclosure [Abstract]
Uncertain tax positions	$ 25,645,000	$ 25,007,000
Long-term lease liabilities	5,309,000	11,449,000
Restructuring accruals	4,760,000	6,839,000
Other	7,953,000	9,700,000
Other liabilities	$ 43,667,000	$ 52,995,000