STOCKHOLDERS' INVESTMENT, EARNINGS PER SHARE AND ACCUMULATED COMPREHENSIVE INCOME Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss, beginning balance	$ (328,277)
Net current period other comprehensive income (loss)	42,183	$ (38,458)	$ (19,490)
Foreign exchange rate impact	25,927	(21,636)	(21,604)
Accumulated other comprehensive loss, ending balance	(286,094)	(328,277)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss, beginning balance	(328,277)	(289,819)	(270,329)
Other comprehensive loss before reclassification	33,495	(44,089)	(25,778)
Reclassified from accumulated other comprehensive loss	8,688	5,631	6,288
Net current period other comprehensive income (loss)	42,183	(38,458)	(19,490)
Foreign exchange rate impact	0	0	0
Accumulated other comprehensive loss, ending balance		(328,277)	(289,819)
Currency Translation Adjustments \| Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss, beginning balance	(149,721)	(67,365)	(39,066)
Other comprehensive loss before reclassification	30,196	(26,947)	(20,195)
Reclassified from accumulated other comprehensive loss	0	0	0
Net current period other comprehensive income (loss)	30,196	(26,947)	(20,195)
Foreign exchange rate impact	40,459	(55,409)	(8,104)
Accumulated other comprehensive loss, ending balance	(79,066)	(149,721)	(67,365)
Pension Liability Adjustments (1) \| Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss, beginning balance	(178,556)	(222,454)	(231,263)
Other comprehensive loss before reclassification	3,713	(17,142)	(5,583)
Reclassified from accumulated other comprehensive loss	8,620	5,631	6,288
Net current period other comprehensive income (loss)	12,333	(11,511)	705
Foreign exchange rate impact	(40,459)	55,409	8,104
Accumulated other comprehensive loss, ending balance	(206,682)	(178,556)	(222,454)
Unrealized loss on cash flow hedges (2) \| Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss, beginning balance	0	0	0
Other comprehensive loss before reclassification	(414)	0	0
Reclassified from accumulated other comprehensive loss	68	0	0
Net current period other comprehensive income (loss)	(346)	0	0
Foreign exchange rate impact	0	0	0
Accumulated other comprehensive loss, ending balance	$ (346)	$ 0	$ 0

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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