CONSOLIDATED STATEMENTS OF STOCKHOLDERS' INVESTMENT AND REDEEMABLE NONCONTROLLING INTERESTS - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Increase (Decrease) in Redeemable Noncontrolling Interests [Roll Forward]
Redeemable Noncontrolling Interest - beginning balance	$ 0	$ 6,886	$ 15,473
Acquisition of noncontrolling interest		(6,121)
Reclassification from redeemable noncontrolling interest to noncontrolling interests		(835)
Currency translation adjustments	0	4,163	(1,739)
Net loss	0	(4,093)	(6,848)
Redeemable Noncontrolling Interest - ending balance	0	0	6,886
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total stockholders' investment, beginning balance, value	$ 1,183,501	$ 1,293,666	1,508,352
Common stock, shares outstanding - beginning balance	35,526,625	35,213,991
Adoption of new accounting guidance	$ (1,746)
Issuance of common stock	8,867	$ 9,808	8,824
Acquisition of noncontrolling interest		6,121
Reclassification from redeemable noncontrolling interest to noncontrolling interests		835
Equity component of 4½% Convertible Senior Notes issued		36,778
Tax impact of 4½% Convertible Senior Notes	592
Purchase of 4½% Convertible Senior Notes call option		(40,393)
Proceeds from issuance of warrants		30,259
Distributions paid to noncontrolling interests	(54)	(49)	(49)
Dividends paid to noncontrolling interest	(580)	(331)	(2,533)
Common stock dividends		(2,465)	(9,831)
Currency translation adjustments	(180)	106	(3,572)
Net income (loss)	(336,138)	(193,017)	(169,067)
Other comprehensive loss	(41,895)	42,183	(38,458)
Total stockholders' investment, ending balance, value	$ 812,367	$ 1,183,501	$ 1,293,666
Common stock, shares outstanding, ending balance	35,918,916	35,526,625	35,213,991
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total stockholders' investment, beginning balance, value	$ 382	$ 379	$ 377
Common stock, shares outstanding - beginning balance	35,526,625	35,213,991	34,976,743
Issuance of common stock	$ 4	$ 3	$ 2
Issuance of common stock, shares	392,291	312,634	237,248
Total stockholders' investment, ending balance, value	$ 386	$ 382	$ 379
Common stock, shares outstanding, ending balance	35,918,916	35,526,625	35,213,991
Additional Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total stockholders' investment, beginning balance, value	$ 852,565	$ 809,995	$ 801,173
Issuance of common stock	8,863	9,805	8,822
Acquisition of noncontrolling interest		6,121
Equity component of 4½% Convertible Senior Notes issued		36,778
Tax impact of 4½% Convertible Senior Notes	592
Purchase of 4½% Convertible Senior Notes call option		(40,393)
Proceeds from issuance of warrants		30,259
Total stockholders' investment, ending balance, value	862,020	852,565	809,995
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total stockholders' investment, beginning balance, value	794,191	991,340	1,170,733
Adoption of new accounting guidance	(1,746)
Common stock dividends		(2,465)	(9,831)
Net income (loss)	(336,847)	(194,684)	(169,562)
Total stockholders' investment, ending balance, value	455,598	794,191	991,340
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total stockholders' investment, beginning balance, value	(286,094)	(328,277)	(289,819)
Other comprehensive loss	(41,895)	42,183	(38,458)
Total stockholders' investment, ending balance, value	(327,989)	(286,094)	(328,277)
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total stockholders' investment, beginning balance, value	(184,796)	(184,796)	(184,796)
Total stockholders' investment, ending balance, value	(184,796)	(184,796)	(184,796)
Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total stockholders' investment, beginning balance, value	7,253	5,025	10,684
Reclassification from redeemable noncontrolling interest to noncontrolling interests		835
Distributions paid to noncontrolling interests	(54)	(49)	(49)
Dividends paid to noncontrolling interest	(580)	(331)	(2,533)
Currency translation adjustments	(180)	106	(3,572)
Net income (loss)	709	1,667	495
Total stockholders' investment, ending balance, value	$ 7,148	$ 7,253	$ 5,025