Consolidated Statements Of Cash Flows - USD ($) $ in Thousands		9 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income		$ 81,846	$ 76,056
Adjustments to reconcile net income to net cash provided (used) by operating activities:
Depreciation		26,106	26,107
Net provision for losses (recoveries) on advances and guaranteed loans to suppliers		4,375	414
Foreign currency remeasurement (gain) loss, net		(3,430)	12,493
Deferred income taxes		(18,967)	(308)
Restructuring and impairment costs	[1]	0	3,860
Other, net		12,131	7,598
Changes in operating assets and liabilities, net		(151,429)	56,533
Net cash provided (used) by operating activities		(49,368)	182,753
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property, plant and equipment		(23,567)	(28,544)
Proceeds from sale of property, plant and equipment		5,072	665
Other		550	0
Net cash used by investing activities		(19,045)	(27,879)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance (repayment) of short-term debt, net		(12,195)	(11,299)
Dividends paid to noncontrolling interests		(1,260)	(1,260)
Repurchase of common stock		(12,639)	0
Dividends paid on convertible perpetual preferred stock		0	(11,061)
Dividends paid on common stock		(40,886)	(36,181)
Other		(2,828)	(2,256)
Net cash used by financing activities		(69,808)	(62,057)
Effect of exchange rate changes on cash		806	(757)
Net increase (decrease) in cash and cash equivalents		(137,415)	92,060
Cash and cash equivalents at beginning of year		283,993	319,447
Cash and cash equivalents at end of period		$ 146,578	411,507
Series B 6.75% Convertible Perpetual Preferred Stock [Member]
Non-cash reclassification of preferred stock converted			$ 107,600
Preferred stock, shares converted to common stock			111,072

[1] Restructuring and impairment costs are excluded from segment operating income, but are included in consolidated operating income in the consolidated statements of income and comprehensive income.