REVENUE FROM CONTRACTS WITH CUSTOMERS (Balance Sheet) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Apr. 01, 2018	Mar. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net	$ 239,736	$ 301,589	$ 247,649
Software development costs and licenses	12,676	22,188	33,284
Deferred cost of goods sold	19,141	27,984	117,851
Prepaid expenses and other	180,512	167,074	133,454
Deferred cost of goods sold, net of current portion	736	1,032	26,719
Other assets	75,917	108,317	56,887
Accrued expenses and other current liabilities	906,881	984,426	914,748
Deferred revenue	450,568	547,008	777,152
Non-current deferred revenue	15,861	19,133	355,589
Other long-term liabilities	191,490	192,621	158,285
Retained earnings	615,482	543,789	73,516
Accumulated other comprehensive loss	(41,015)	$ (11,079)	$ (15,732)
Amounts without adoption of New Revenue Accounting Standard
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net	197,465
Software development costs and licenses	17,571
Deferred cost of goods sold	83,632
Prepaid expenses and other	121,359
Deferred cost of goods sold, net of current portion	19,414
Other assets	59,696
Accrued expenses and other current liabilities	854,006
Deferred revenue	703,172
Non-current deferred revenue	296,541
Other long-term liabilities	155,111
Retained earnings	140,620
Accumulated other comprehensive loss	(39,764)
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	42,271
Software development costs and licenses	(4,895)
Deferred cost of goods sold	(64,491)
Prepaid expenses and other	59,153
Deferred cost of goods sold, net of current portion	(18,678)
Other assets	16,221
Accrued expenses and other current liabilities	52,875
Deferred revenue	(252,604)
Non-current deferred revenue	(280,680)
Other long-term liabilities	36,379
Retained earnings	474,862
Accumulated other comprehensive loss	$ (1,251)