INCOME TAXES - Reconciliation of Income Tax Expense (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Income Tax Contingency [Line Items]
Income taxes based on domestic statutory rates	$ 88,552	$ 63,044	$ 77,295
Effect of tax rate differential	(244,128)	(85,132)	(62,072)
Change in liability for uncertain tax positions	22,180	684	(13,724)
Change in valuation allowance	297,330	78,728	1,049
Recognition of prior year taxes recoverable	(53,757)	0	0
Other	(17,818)	(6,040)	8,046
Provision for income taxes	92,359	51,284	10,594
Income resulting from tax holidays and tax incentives	$ 21,700	$ 15,500	$ 6,600
Effect on basic loss per share due to income resulting from tax holidays and tax incentives (in dollars per share)	$ 0.04	$ 0.03	$ 0.01
Effect on diluted loss per share due to income resulting from tax holidays and tax incentives (in dollars per share)	$ 0.04	$ 0.03	$ 0.01
Expiration date of existing holidays	2027
Tax Cuts And Jobs Act Of 2017, reduced tax assets and valuation allowance	$ 705,300
Tax effect of foreign income not repatriated to Singapore	65,800	$ 67,900	$ 36,600
Valuation Allowance and Deferred Tax Assets, Profitability Forecasted
Income Tax Contingency [Line Items]
Increase (decrease) in valuation allowance	(1,300)	(39,600)	(63,300)
Valuation Allowance and Deferred Tax Assets, Current Period Losses
Income Tax Contingency [Line Items]
Increase (decrease) in valuation allowance	(65,900)	$ 103,900	$ 64,300
Brazil
Income Tax Contingency [Line Items]
Recognition of prior year taxes recoverable	53,700
Subsidiaries | Brazil
Income Tax Contingency [Line Items]
Increase (decrease) in valuation allowance	$ 364,500