Long Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Debt Instrument [Line Items]
Long-term debt	$ 155,273	$ 239,129
Less current portion		2,540
Total long-term debt	155,273	236,589
Senior Unsecured 3.375% Convertible Notes Due 2038
Debt Instrument [Line Items]
Long-term debt	155,273	148,272
2011 Credit Facility Due 2016
Debt Instrument [Line Items]
Long-term debt		79,400
China Term Loan due 2017
Debt Instrument [Line Items]
Long-term debt		6,034
India Term Loan due 2017
Debt Instrument [Line Items]
Long-term debt		5,383
Other
Debt Instrument [Line Items]
Long-term debt		$ 40