DERIVATIVE FINANCIAL INSTRUMENTS Narrative (Details) - Foreign Exchange Contract £ in Millions, $ in Millions	6 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2018 GBP (£)	Mar. 31, 2018 GBP (£)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount | £		£ 5	£ 5
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred | $	$ 1.3