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Segment Information (Details 3) (USD $)
In Thousands, unless otherwise specified
3 Months Ended6 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Mar. 31, 2011
Net sales to unaffiliated customers and long-lived assets by geographic region     
Total net sales$ 589,204$ 581,884$ 1,069,645$ 1,061,214 
Total long-lived assets83,674 83,674 89,633
Americas
     
Net sales to unaffiliated customers and long-lived assets by geographic region     
Total net sales232,823240,099458,811462,067 
Total long-lived assets31,835 31,835 34,587
EMEA
     
Net sales to unaffiliated customers and long-lived assets by geographic region     
Total net sales220,384227,266351,267381,895 
Total long-lived assets9,172 9,172 9,774
Asia Pacific
     
Net sales to unaffiliated customers and long-lived assets by geographic region     
Total net sales135,997114,519259,567217,252 
Total long-lived assets$ 42,667 $ 42,667 $ 45,272
Minimum | United States | Consolidated long-lived assets | Geographic Concentration
     
Concentration risk     
Percentage of benchmark derived from specified source (as a percent)10.00% 10.00% 10.00%
United States | Consolidated net sales | Geographic Concentration
     
Concentration risk     
Percentage of benchmark derived from specified source (as a percent)33.00%34.00%36.00%36.00% 
Minimum | China | Consolidated long-lived assets | Geographic Concentration
     
Concentration risk     
Percentage of benchmark derived from specified source (as a percent)10.00% 10.00% 10.00%
China | Consolidated net sales | Geographic Concentration
     
Concentration risk     
Percentage of benchmark derived from specified source (as a percent)  10.00%  
Minimum | Consolidated net sales | Geographic Concentration
     
Concentration risk     
Threshold not reached for reporting individual countries (as a percent)10.00%10.00%10.00%10.00% 
Consolidated net sales | Geographic Concentration | No other single country
     
Concentration risk     
Threshold not reached for reporting individual countries (as a percent)10.00%    
Consolidated net sales | Customer Concentration | Single customer group
     
Concentration risk     
Percentage of benchmark derived from specified source (as a percent)13.00%13.00%12.00%13.00%