RECENT ACCOUNTING PRONOUNCEMENTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred revenue	$ 2,300
Excess tax benefits	2,700
Reclassification of excess tax benefits from financing activities	60,446	$ 47,968	$ 60,237
Reclassification of excess tax benefits into operating activities	$ 121,148	139,387	150,409
ASU 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of excess tax benefits from financing activities		1,400	3,500
Reclassification of excess tax benefits into operating activities		$ 1,400	$ 3,500