Short-Term Borrowing Arrangements (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Short-term Debt [Line Items]
Short-term debt	$ 374,532	$ 231,407
Unsued lines of credit	600,438
Compensating balance	302	296
Line of Credit [Member]
Short-term Debt [Line Items]
Short-term debt, maximum outstanding amount	655,154	798,599
Short-term debt, weighted average interest rate	2.90%	3.50%
Short-term debt	374,532	231,407
Unsued lines of credit	266,641	553,211
Inventory pledged as collateral	13,906	2,849
Compensating balance	302	296
Letter of Credit [Member]
Short-term Debt [Line Items]
Unsued lines of credit	13,981
Non-US Based [Member] | Line of Credit [Member]
Short-term Debt [Line Items]
Short-term debt	$ 12,938	$ 2,818