Employee Benefits Fair Value of Plan Assets (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
U.S. Pension Plans [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 19	$ 48
U. S. equities	12,716	12,933
International equities	12,098	12,911
International fixed income funds	2,082	2,523
U. S. fixed income funds	8,641	7,966
Diversified funds	3,945	3,298
Real estate equities	0	0
Total Assets	39,501	39,679
U.S. Pension Plans [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	923	1,279
U. S. equities	0	0
International equities	0	0
International fixed income funds	0	0
U. S. fixed income funds	0	0
Diversified funds	0	0
Real estate equities	0	0
Total Assets	923	1,279
U.S. Pension Plans [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
U. S. equities	0	0
International equities	0	0
International fixed income funds	0	0
U. S. fixed income funds	0	0
Diversified funds	270	505
Real estate equities	4,470	3,793
Total Assets	4,740	4,298
U.S. Pension Plans [Member] | Total Assets / Liabilities, at Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	942	1,327
U. S. equities	12,716	12,933
International equities	12,098	12,911
International fixed income funds	2,082	2,523
U. S. fixed income funds	8,641	7,966
Diversified funds	4,215	3,803
Real estate equities	4,470	3,793
Total Assets	45,164	45,256
Non-U.S. Pension Plans [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	607	419
U. S. equities	7,628	7,876
International equities	4,077	4,589
Global equity funds	0	0
International fixed income funds	0	0
U. S. fixed income funds	2,724	2,642
Global fixed income funds	1,288	1,257
Diversified funds	1,830	1,823
Real estate equities	917	971
Total Assets	19,071	19,577
Non-U.S. Pension Plans [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
U. S. equities	0	0
International equities	7,037	6,593
Global equity funds	7,185	6,621
International fixed income funds	5,092	4,355
U. S. fixed income funds	0	0
Global fixed income funds	2,333	2,163
Diversified funds	0	0
Real estate equities	0	0
Total Assets	21,647	19,732
Non-U.S. Pension Plans [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
U. S. equities	0	0
International equities	0	0
Global equity funds	0	0
International fixed income funds	0	0
U. S. fixed income funds	0	0
Global fixed income funds	0	0
Diversified funds	2,244	2,245
Real estate equities	0	0
Total Assets	2,244	2,245
Non-U.S. Pension Plans [Member] | Total Assets / Liabilities, at Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	607	419
U. S. equities	7,628	7,876
International equities	11,114	11,182
Global equity funds	7,185	6,621
International fixed income funds	5,092	4,355
U. S. fixed income funds	2,724	2,642
Global fixed income funds	3,621	3,420
Diversified funds	4,074	4,068
Real estate equities	917	971
Total Assets	$ 42,962	$ 41,554