OTHER ACCRUED EXPENSES: (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Other Accrued Expenses [Abstract].
Accrued purchase consideration (see Note 3 - Acquisitions)	$ 0	$ 5,880
Liabilities of non-qualified retirement plan (see Note 5 - Other Current and Noncurrent Assets)	13,551	12,716
Other accrued expenses	42,314	41,265
Other accrued expenses	$ 55,865	$ 59,861