Employee Benefits Plan Assets (Details)	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2012 Cash and cash equivalents [Member]	Mar. 31, 2012 Equity securities [Member]	Mar. 31, 2012 Debt securities [Member]	Mar. 31, 2012 Real estate and other investments [Member]	Mar. 31, 2012 U.S. Pension Plans [Member]	Mar. 31, 2011 U.S. Pension Plans [Member]	Mar. 31, 2012 U.S. Pension Plans [Member] Cash and cash equivalents [Member]	Mar. 31, 2011 U.S. Pension Plans [Member] Cash and cash equivalents [Member]	Mar. 31, 2012 U.S. Pension Plans [Member] Equity securities [Member]	Mar. 31, 2011 U.S. Pension Plans [Member] Equity securities [Member]	Mar. 31, 2012 U.S. Pension Plans [Member] Debt securities [Member]	Mar. 31, 2011 U.S. Pension Plans [Member] Debt securities [Member]	Mar. 31, 2012 U.S. Pension Plans [Member] Real estate and other investments [Member]	Mar. 31, 2011 U.S. Pension Plans [Member] Real estate and other investments [Member]	Mar. 31, 2012 Non-U.S. Pension Plans [Member]	Mar. 31, 2011 Non-U.S. Pension Plans [Member]	Mar. 31, 2012 Non-U.S. Pension Plans [Member] Cash and cash equivalents [Member]	Mar. 31, 2011 Non-U.S. Pension Plans [Member] Cash and cash equivalents [Member]	Mar. 31, 2012 Non-U.S. Pension Plans [Member] Equity securities [Member]	Mar. 31, 2011 Non-U.S. Pension Plans [Member] Equity securities [Member]	Mar. 31, 2012 Non-U.S. Pension Plans [Member] Debt securities [Member]	Mar. 31, 2011 Non-U.S. Pension Plans [Member] Debt securities [Member]	Mar. 31, 2012 Non-U.S. Pension Plans [Member] Real estate and other investments [Member]	Mar. 31, 2011 Non-U.S. Pension Plans [Member] Real estate and other investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan asset allocations						100.00%	100.00%	2.10%	2.90%	54.90%	57.30%	23.70%	23.10%	19.30%	16.70%	100.00%	100.00%	1.40%	1.00%	60.40%	62.00%	26.60%	25.00%	11.60%	12.00%
Target plan asset allocations	100.00%	2.00%	54.00%	25.00%	19.00%