Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2014 Segment		Dec. 31, 2013
Segment Reporting Information [Line Items]
Number of business segments					4
Net sales
Net sales	$ 692,568		$ 759,666		$ 1,999,128		$ 2,139,710
Operating income (loss)
Operating income (loss)	3,831		15,356		(14,677)		7,265
Restructuring and impairments, net	278	[1]	3,329	[1]	17,910	[1]	14,653	[1]
Total operating income (loss)	3,553		12,027		(32,587)		(7,388)
Depreciation and Amortization
Depreciation and amortization	19,322		20,202		58,785		60,129
Capital expenditures
Capital expenditures	30,968		15,114		76,936		51,378
Transportation Americas
Net sales
Net sales	179,066		189,515		497,722		564,959
Operating income (loss)
Operating income (loss)	(10,242)		(280)		(39,521)		(21,344)
Restructuring and impairments, net	635		(1,306)		14,497		7,973
Depreciation and Amortization
Depreciation and amortization	6,305		6,186		17,670		19,346
Capital expenditures
Capital expenditures	5,519		5,422		19,126		18,406
Transportation Europe & ROW
Net sales
Net sales	243,255		283,663		657,707		689,832
Operating income (loss)
Operating income (loss)	10,296		15,986		16,751		15,957
Restructuring and impairments, net	60		3,160		230		877
Depreciation and Amortization
Depreciation and amortization	5,441		5,466		17,084		15,667
Capital expenditures
Capital expenditures	12,675		5,079		32,360		21,075
Industrial Energy Americas
Net sales
Net sales	71,526		75,375		256,495		281,734
Operating income (loss)
Operating income (loss)	4,159		4,785		14,921		22,486
Restructuring and impairments, net	256		77		364		233
Depreciation and Amortization
Depreciation and amortization	2,726		2,869		7,955		8,732
Capital expenditures
Capital expenditures	5,529		585		9,233		1,977
Industrial Energy Europe & ROW
Net sales
Net sales	198,721		211,113		587,204		603,185
Operating income (loss)
Operating income (loss)	7,337		4,880		16,495		15,130
Restructuring and impairments, net	(673)		1,258		2,814		4,917
Depreciation and Amortization
Depreciation and amortization	3,870		4,574		12,422		13,104
Capital expenditures
Capital expenditures	5,991		2,809		12,243		6,406
Unallocated corporate expenses
Operating income (loss)
Operating income (loss)	(7,719)		(10,015)		(23,323)		(24,964)
Restructuring and impairments, net	0		140		5		653
Depreciation and Amortization
Depreciation and amortization	980		1,107		3,654		3,280
Capital expenditures
Capital expenditures	$ 1,254		$ 1,219		$ 3,974		$ 3,514

[1] See Note 13 to the Consolidated Financial Statements.