REVENUE RECOGNITION - Contract Balances (Details) - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2018	Apr. 01, 2018	Mar. 31, 2018
ASSETS:
Customer accounts receivable	$ 267,409	$ 205,299
Increase (decrease) in customer accounts receivable	62,110
Unbilled receivables	3,404	4,338
Increase (decrease) of unbilled receivables	(934)
Other receivables	3,106	4,996
Increase (decrease) in other receivables	(1,890)
Long-term unbilled receivables	3,254	2,254
Increase (decrease) of long-term unbilled receivables	1,000
Contract assets	277,173	216,887
Increase (decrease) in contract assets	60,286
LIABILITIES:
Deferred revenue	260,926	271,698	$ 301,925
Increase (decrease) in deferred revenue	(10,772)
Deferred revenue, long-term	84,881	90,157	$ 91,409
Increase (decrease) in deferred revenue, long-term	(5,276)
Contract liabilities	345,807	$ 361,855
Increase (decrease) in contract liabilities	$ (16,048)