Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 118,148	$ 120,461	$ 155,155
Adjustments to reconcile net income to net cash provided (used) by operating activities:
Depreciation	36,754	35,394	37,257
Amortization	890	1,930	1,642
Provisions for losses on advances and guaranteed loans to suppliers	815	3,734	6,705
Inventory write-downs	11,899	18,612	7,654
Stock-based compensation expense	5,206	6,230	6,278
Foreign currency remeasurement loss (gain), net	22,517	28,836	14,322
Deferred income taxes	15,046	(13,662)	(2,176)
Equity in net income of unconsolidated affiliates, net of dividends	156	(1,075)	3,420
Gain on favorable outcome of excise tax case in Brazil	0	(12,676)	(81,619)
Fair value gain upon acquisition of partner's interest in joint venture	(3,390)	0	0
Restructuring and impairment costs	2,389	4,890	6,746
Other, net	12,314	(9,272)	2,251
Changes in operating assets and liabilities, net:
Accounts and notes receivable	(2,806)	49,414	(89,536)
Inventories and other assets	(7,370)	37,751	(47,492)
Income taxes	(1,503)	4,790	11,391
Accounts payable and accrued liabilities	(13,678)	(63,257)	(27,345)
Customer advances and deposits	(13,796)	14,397	(8,156)
Net cash provided (used) by operating activities	183,591	226,497	(3,503)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property, plant and equipment	(47,153)	(58,385)	(45,849)
Purchase of partner's interest in joint venture, net of cash held by the business	(5,964)	0	0
Proceeds from sale of property, plant and equipment	2,982	4,522	2,746
Other, net	(796)	(141)	1,033
Net cash used by investing activities	(50,931)	(54,004)	(42,070)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance (repayment) of short-term debt, net	4,880	2,618	(43,727)
Issuance of long-term debt	0	370,000	175,000
Repayment of long-term debt	0	(356,250)	(211,250)
Dividends paid to noncontrolling interests	(4,449)	(4,183)	(1,971)
Issuance of common stock	0	187	457
Repurchase of convertible perpetual preferred stock	0	(1,497)	0
Repurchase of common stock	0	(31,227)	(14,145)
Dividends paid on convertible perpetual preferred stock	(14,748)	(14,824)	(14,850)
Dividends paid on common stock	(47,389)	(47,337)	(46,721)
Debt issuance costs and other	0	(3,621)	(875)
Net cash used by financing activities	(61,706)	(86,134)	(158,082)
Effect of exchange rate changes on cash	(290)	(1,108)	(677)
Net increase (decrease) in cash and cash equivalents	70,664	85,251	(204,332)
Cash and cash equivalents at beginning of year	248,783	163,532	367,864
Cash and cash equivalents at end of year	319,447	248,783	163,532
Supplemental information - cash paid for:
Interest	15,704	19,184	25,116
Income taxes, net of refunds	$ 38,732	$ 46,044	$ 65,511