Segment Information (As Restated) (Tables)

12 Months Ended

Mar. 31, 2015

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

		Years Ended March 31,
	Analysis of Segment Operations	2015			2014			2013
Sales and other operating revenues:
	North America	$	440,985		$	498,365		$	480,131
	Other Regions	1,625,880			1,856,171			1,760,865
	Total revenue	$	2,066,865		$	2,354,536		$	2,240,996
Operating income:
	North America	$	40,343		$	31,772		$	39,402
	Other Regions	57,626			74,447			122,799
Total operating income		97,969			106,219			162,201
	Debt retirement expense	(771		)	57,449			1,195
	Interest expense	113,273			116,827			114,528
	Interest income	6,268			7,068			6,547
Income (loss) before income taxes and other items		$	(8,265	)	$	(60,989	)	$	53,025

		Years Ended March 31,
	Analysis of Segment Assets	2015		2014		2013
Segment assets:
	North America	$	231,131	$	227,173	$	249,932
	Other Regions	1,395,515		1,520,840		1,645,441
	Total assets	$	1,626,646	$	1,748,013	$	1,895,373
Trade and other receivables, net
	North America	$	26,781	$	26,551	$	36,017
	Other Regions	166,589		139,902		179,518
	Total trade and other receivables, net	$	193,370	$	166,453	$	215,535
Goodwill:
	North America	$	2,794	$	2,794	$	2,794
	Other Regions	—		—		—
	Total Goodwill	$	2,794	$	2,794	$	2,794
Equity in net assets of investee companies:
	North America	$	—	$	—	$	—
	Other Regions	53,678		50,390		23,986
	Total equity in net assets of investee companies	$	53,678	$	50,390	$	23,986
Depreciation and amortization:
	North America	$	5,618	$	5,899	$	5,756
	Other Regions	24,005		26,528		28,055
	Total depreciation and amortization	$	29,623	$	32,427	$	33,811
Capital expenditures:
	North America	$	10,044	$	13,802	$	13,014
	Other Regions	12,629		13,953		29,789
	Total capital expenditures	$	22,673	$	27,755	$	42,803

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area

		Years Ended March 31,
Sales by Destination		2015		2014		2013
Sales and Other Operating Revenues:
	United States	$	363,964	$	467,111	$	423,617
	China	254,658		401,480		308,935
	Belgium	137,513		125,377		185,668
	Russia	118,233		125,093		147,283
	Germany	116,713		130,163		93,990
	Indonesia	58,609		58,919		109,983
	Other	1,017,175		1,046,393		971,520
		$	2,066,865	$	2,354,536	$	2,240,996

Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country

		Years Ended March 31,
Property, Plant and Equipment by Location		2015		2014		2013
Property, Plant and Equipment, Net:
	United States	$	57,861	$	53,517	$	45,213
	Brazil	87,161		92,142		99,492
	Malawi	25,704		27,227		28,683
	Tanzania	23,610		24,979		24,568
	Europe	15,191		19,711		20,370
	Argentina	7,390		7,325		7,909
	Asia	6,960		7,545		8,436
	Zambia	6,582		6,690		6,316
	Turkey	3,454		18,310		25,666
	Other	4,001		3,728		4,279
		$	237,914	$	261,174	$	270,932