Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013	Sep. 30, 2012
Net sales
Net sales	$ 697,802		$ 711,692		$ 1,380,044	$ 1,405,130
Operating income
Operating income	8,040		7,944		(8,091)	8,514
Restructuring and impairments, net	2,601	[1]	1,108	[1]	11,325	624
Total Operating Income	5,439		6,836		(19,416)	7,890
Depreciation & Amortization
Depreciation and amortization	19,436		19,531		39,927	39,442
Capital expenditures
Capital expenditures	16,736		25,535		36,268	49,621
Transportation Americas [Member]
Net sales
Net sales	185,233		213,038		375,445	428,179
Operating income
Operating income	(5,119)		(5,593)		(21,064)	(15,011)
Restructuring and impairments, net	1,941		138		9,280	138
Depreciation & Amortization
Depreciation and amortization	6,180		6,860		13,160	13,923
Capital expenditures
Capital expenditures	7,599		11,059		12,985	20,021
Transportation Europe and ROW [Member]
Net sales
Net sales	219,732		211,120		406,169	405,263
Operating income
Operating income	4,498		4,976		(29)	8,998
Restructuring and impairments, net	(2,207)		241		(2,284)	155
Depreciation & Amortization
Depreciation and amortization	4,978		4,492		10,201	9,299
Capital expenditures
Capital expenditures	5,239		7,869		15,996	15,984
Industrial Energy Americas [Member]
Net sales
Net sales	104,741		98,862		206,358	185,550
Operating income
Operating income	13,074		7,105		17,700	13,517
Restructuring and impairments, net	63		360		156	408
Depreciation & Amortization
Depreciation and amortization	2,884		2,590		5,863	5,271
Capital expenditures
Capital expenditures	406		3,014		1,392	5,988
Industrial Energy Europe and ROW [Member]
Net sales
Net sales	188,096		188,672		392,072	386,138
Operating income
Operating income	4,172		8,599		10,250	14,788
Restructuring and impairments, net	2,589		369		3,659	(37)
Depreciation & Amortization
Depreciation and amortization	4,186		4,329		8,531	8,788
Capital expenditures
Capital expenditures	2,014		3,011		3,598	4,640
Unallocated corporate expenses [Member]
Operating income
Operating income	(8,585)		(7,143)		(14,948)	(13,778)
Restructuring and impairments, net	215		0		514	(40)
Depreciation & Amortization
Depreciation and amortization	1,208		1,260		2,172	2,161
Capital expenditures
Capital expenditures	$ 1,478		$ 582		$ 2,297	$ 2,988

[1] See Note 13 for detail by segment.