Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 110,134	$ 116,168	$ 112,506
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	37,104	34,836	35,911
Provision for losses (recoveries) on advances and guaranteed loans to suppliers	(2,339)	3,730	(857)
Inventory write-downs	4,002	7,687	10,866
Stock-based compensation expense	8,152	7,610	6,475
Foreign currency remeasurement loss (gain), net	1,786	(184)	9,269
Deferred income taxes	3,873	(11,132)	16,626
Equity in net income of unconsolidated affiliates, net of dividends	3,659	(1,521)	396
Restructuring and impairment costs	20,304	0	4,359
Restructuring payments	(4,014)	(315)	(2,020)
Other, net	5,613	(7,866)	(4,463)
Changes in operating assets and liabilities, net:
Accounts and notes receivable	(8,373)	38,264	(14,346)
Inventories and other assets	33,796	(116,728)	52,139
Income taxes	(8,981)	1,239	(1,719)
Accounts payable and other accrued liabilities	(54,912)	13,397	30,663
Customer advances and deposits	14,718	(3,940)	(5,490)
Net cash provided by operating activities	164,522	81,245	250,315
Cash Flows From Investing Activities:
Purchase of property, plant and equipment	(38,760)	(34,037)	(35,630)
Proceeds from sale of property, plant and equipment	2,061	5,194	2,174
Other	2,000	1,450	(398)
Net cash used by investing activities	(34,699)	(27,393)	(33,854)
Cash Flows From Financing Activities:
Issuance (repayment) of short-term debt, net	12,036	(18,159)	(5,349)
Issuance of long-term debt	41,147	0	0
Repayment of long-term debt	41,147	0	0
Dividends paid to noncontrolling interests in subsidiaries	(5,938)	(7,350)	(4,200)
Conversion of convertible perpetual preferred stock	0	0	(178,365)
Repurchase of common stock	(1,443)	(21,610)	0
Dividends paid on convertible perpetual preferred stock	0	0	(11,061)
Dividends paid on common stock	(69,883)	(54,699)	(49,828)
Proceeds from termination of interest rate swap agreements	5,428	0	0
Debt issuance costs and other	(5,987)	(2,828)	(2,441)
Net cash used by financing activities	(65,787)	(104,646)	(251,244)
Effect of exchange rate changes on cash	(608)	929	(671)
Net increase (decrease) in cash and cash equivalents	63,428	(49,865)	(35,454)
Cash and cash equivalents at beginning of year	234,128	283,993	319,447
Cash and Cash Equivalents at End of Year	297,556	234,128	283,993
Non-cash reclassification of preferred stock converted			0
Supplemental information—cash paid for:
Interest	16,462	15,621	16,284
Income taxes, net of refunds	$ 44,856	$ 58,339	37,294
Series B 6.75% Convertible Perpetual Preferred Stock [Member]
Cash Flows From Financing Activities:
Non-cash reclassification of preferred stock converted			$ 107,600
Preferred stock, shares converted to common stock	0	0	111,072