Employee Benefits Amounts Showing in Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Prior service credit (cost)	$ 945	$ 2,400
Net actuarial losses	(61,679)	(48,188)
Deferred taxes	11,266	10,037
Balance at	(35,751)
Prior service credit (cost)	(1,455)
Net actuarial losses	(13,491)
Deferred taxes	1,229
Total change	(13,717)
Balance at	(49,468)
U.S. and Non-U.S. Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service credit (cost)	(2,191)	(2,413)
Net actuarial losses	(55,033)	(41,674)
Deferred taxes	11,708	10,572
Balance at	(33,515)
Prior service credit (cost)	222
Net actuarial losses	(13,359)
Deferred taxes	1,136
Total change	(12,001)
Balance at	(45,516)
U.S. and Non-U.S. Post-retirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service credit (cost)	3,136	4,813
Net actuarial losses	(6,646)	(6,514)
Deferred taxes	(442)	(535)
Balance at	(2,236)
Prior service credit (cost)	(1,677)
Net actuarial losses	(132)
Deferred taxes	93
Total change	(1,716)
Balance at	$ (3,952)