EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 01, 2019	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
EMPLOYEE BENEFIT PLANS [Abstract]
Company match	50.00%			50.00%
Portion of employee compensation matched under 401(k)				6.00%
Non-elective company contribution as percentage of employee salary	3.00%			3.00%
Vesting of matching contributions	100.00%			100.00%
Company contributions		$ 7.1	$ 4.5	$ 4.2