REVENUE FROM CONTRACTS WITH CUSTOMERS (Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Apr. 01, 2018	Mar. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net	$ 823,482	$ 301,589	$ 247,649
Software development costs and licenses	33,542	22,188	33,284
Deferred cost of goods sold	57,280	27,984	117,851
Prepaid expenses and other	179,454	167,074	133,454
Software development costs and licenses, net of current portion	597,497		639,369
Deferred cost of goods sold, net of current portion	7,819	1,032	26,719
Deferred tax assets	146,216		4,930
Accrued expenses and other current liabilities	1,206,332	984,426	914,748
Deferred revenue	818,411	547,008	777,152
Non-current deferred revenue	69,137	19,133	355,589
Other long-term liabilities	191,198	192,621	158,285
Retained earnings (accumulated deficit)	820,796	543,789	73,516
Accumulated other comprehensive loss	(50,954)	$ (11,079)	$ (15,732)
Amounts without adoption of New Revenue Accounting Standard
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net	746,971
Software development costs and licenses	47,223
Deferred cost of goods sold	198,202
Prepaid expenses and other	218,016
Software development costs and licenses, net of current portion	759,754
Deferred cost of goods sold, net of current portion	88,941
Deferred tax assets	168,414
Accrued expenses and other current liabilities	1,098,639
Deferred revenue	1,457,069
Non-current deferred revenue	734,057
Other long-term liabilities	217,492
Retained earnings (accumulated deficit)	(23,323)
Accumulated other comprehensive loss	(46,783)
Increase (decrease) due to adoption of New Revenue Accounting Standard | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net	76,511
Software development costs and licenses	(13,681)
Deferred cost of goods sold	(140,922)
Prepaid expenses and other	(38,562)
Software development costs and licenses, net of current portion	(162,257)
Deferred cost of goods sold, net of current portion	(81,122)
Deferred tax assets	(22,198)
Accrued expenses and other current liabilities	107,693
Deferred revenue	(638,658)
Non-current deferred revenue	(664,920)
Other long-term liabilities	(26,294)
Retained earnings (accumulated deficit)	844,119
Accumulated other comprehensive loss	$ (4,171)