INCOME TAXES - UNCERTAIN TAX POSITIONS (Details) - USD ($)	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Aggregate changes to the liability for gross uncertain tax position, excluding interest and penalties
Balance, beginning of period	$ 52,799,000	$ 40,591,000	$ 23,536,000
Additions:
Current year tax positions	65,669,000	12,208,000	8,297,000
Prior year tax positions	5,086,000	0	9,040,000
Reduction of prior year tax positions	0	0	0
Lapse of statute of limitations	(7,469,000)	0	(256,000)
Other, net	0	0	(26,000)
Balance, end of period	116,085,000	52,799,000	40,591,000
Increase in interest and penalties	877,000	1,098,000	$ 771,000
Gross amount of interest and penalties accrued	4,090,000	$ 3,213,000
Possible decrease in unrecognized tax benefits	$ 31,000,000