INCOME TAXES - Reconciliation of Income Tax Expense (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Income Tax Contingency [Line Items]
Income taxes based on domestic statutory rates	$ 63,044	$ 77,295	$ 114,011
Effect of tax rate differential	(85,132)	(62,072)	(75,699)
Change in liability for uncertain tax positions	684	(13,724)	29,729
Change in valuation allowance	78,728	1,049	2,495
Other	(6,040)	8,046	(682)
Provision for income taxes	51,284	10,594	69,854
Income resulting from tax holidays and tax incentives	$ 15,500	$ 6,600	$ 9,800
Effect on basic loss per share due to income resulting from tax holidays and tax incentives (in dollars per share)	$ 0.03	$ 0.01	$ 0.02
Effect on diluted loss per share due to income resulting from tax holidays and tax incentives (in dollars per share)	$ 0.03	$ 0.01	$ 0.02
Expiration date of existing holidays	2022
Tax effect of foreign income not repatriated to Singapore	$ 67,900	$ 36,600	$ 0
Valuation Allowance and Deferred Tax Assets, Profitability Forecasted
Income Tax Contingency [Line Items]
Increase (decrease) in valuation allowance	(39,600)	(63,300)	(55,000)
Valuation Allowance and Deferred Tax Assets, Current Period Losses
Income Tax Contingency [Line Items]
Increase (decrease) in valuation allowance	103,900	$ 64,300	$ 57,500
Subsidiaries | China
Income Tax Contingency [Line Items]
Increase (decrease) in valuation allowance	$ 14,400