Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Net sales
Net sales	$ 804,879	$ 784,051	$ 2,210,009	$ 2,302,099
Operating income
Operating income	20,502	30,329	29,016	66,716
Restructuring and impairments, net	15,776	2,145	16,400	3,722
Total Operating Income	4,726	28,184	12,616	62,994
Depreciation & Amortization
Depreciation and amortization	19,432	20,705	58,873	63,990
Capital expenditures
Capital expenditures	25,216	28,738	74,838	71,931
Transportation Americas [Member]
Net sales
Net sales	231,183	234,487	659,362	676,521
Operating income
Operating income	2,864	3,021	(12,148)	(716)
Restructuring and impairments, net	4,025	1,325	4,165	1,949
Depreciation & Amortization
Depreciation and amortization	7,007	7,120	20,930	20,859
Capital expenditures
Capital expenditures	7,873	8,449	27,894	26,915
Transportation Europe and ROW [Member]
Net sales
Net sales	282,653	269,104	687,916	743,802
Operating income
Operating income	8,611	19,451	17,609	38,300
Restructuring and impairments, net	7,713	438	7,868	(16)
Depreciation & Amortization
Depreciation and amortization	4,680	4,471	13,979	14,570
Capital expenditures
Capital expenditures	11,487	8,106	27,442	23,165
Industrial Energy Americas [Member]
Net sales
Net sales	85,533	75,973	271,084	255,512
Operating income
Operating income	7,703	11,578	21,220	32,486
Restructuring and impairments, net	27	209	436	555
Depreciation & Amortization
Depreciation and amortization	2,799	2,830	8,070	8,902
Capital expenditures
Capital expenditures	2,287	1,238	8,275	5,347
Industrial Energy Europe and ROW [Member]
Net sales
Net sales	205,510	204,487	591,647	626,264
Operating income
Operating income	9,039	5,777	23,827	19,442
Restructuring and impairments, net	3,927	331	3,890	1,014
Depreciation & Amortization
Depreciation and amortization	3,886	5,160	12,674	15,887
Capital expenditures
Capital expenditures	3,301	4,540	7,941	9,807
Unallocated corporate expenses [Member]
Operating income
Operating income	(7,715)	(9,498)	(21,492)	(22,796)
Restructuring and impairments, net	84	(158)	41	220
Depreciation & Amortization
Depreciation and amortization	1,060	1,124	3,220	3,772
Capital expenditures
Capital expenditures	$ 268	$ 6,405	$ 3,286	$ 6,697