REVENUE RECOGNITION Contract Assets, Liabilities and Receivables (Details) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Accounts receivable	$ 228,793		$ 216,791
Contract with Customer, Liability	5,800		10,000
Contract with Customer, Liability, Revenue Recognized	8,300
Contract with Customer, Asset, after Allowance for Credit Loss	0		0
Contract with Customer, Performance Obligation Satisfied in Previous Period	0	$ 1,000
Revenue from Contract with Customer Benchmark [Member]
Disaggregation of Revenue [Line Items]
Accounts receivable	$ 187,000		$ 164,700