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Financial Instruments (Tables)
 12 Months Ended
Mar. 31, 2014
Financial Instruments  
Schedule of financial assets and liabilities accounted for at fair value and classified by level within the fair value hierarchy

The following table presents the Company's financial assets and liabilities, that were accounted for at fair value, excluding assets related to the Company's defined benefit pension plans, classified by the level within the fair value hierarchy (in thousands):

 
   March 31, 2014   March 31, 2013  
 
   Level 1   Level 2   Level 1   Level 2  

Cash equivalents:

                          

Cash equivalents

     200,641     —     119,073     —  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

   $ 200,641   $ —   $ 119,073   $ —  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Trading investments for deferred compensation plan:

                          

Money market funds

   $ 3,139   $ —   $ 4,220   $ —  

Mutual funds

     13,472     —     11,379     —  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

   $ 16,611   $ —   $ 15,599   $ —  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Foreign exchange derivative assets

   $ —   $ 155   $ —   $ 1,197  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Foreign exchange derivative liabilities

   $ —   $ 701 $ —   $ 707
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   
Schedule of changes in the Company's Level 3 financial assets

The following table presents the changes in the Company's Level 3 financial assets during fiscal years 2013 and 2012 (in thousands):

 
   Years Ended March 31,  
 
   2013   2012  

Beginning of the period

   $ 429   $ 1,695  

Sale of securities

     (917 )   (6,550 )

Gain on sale of securities

     831     6,041  

Reversal of unrealized gain

     (343 )   (757 )
           
​ ​ ​ ​ ​ ​ ​ ​

End of the period

   $ —   $ 429  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
           
Schedule of fair values of derivative instruments and their locations on the balance sheets

The following table presents the fair values of the Company's derivative instruments and their locations on its consolidated balance sheets as of March 31, 2014 and 2013 (in thousands):

 
   Derivatives  
 
   Asset   Liability  
 
   March 31,   March 31,  
 
   2014   2013   2014   2013  

Designed as hedging instruments:

                          

Cash flow hedges

   $ 4   $ 1,165   $ 243   $ —  

Not designed as hedging instruments:

                          

Foreign exchange forward contract

     23     —     96     270  

Foreign exchange swap contract

     128     32     362     437  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

     151     32     458     707  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

   $ 155   $ 1,197   $ 701   $ 707  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   
Schedule of amounts of gains and losses on derivative instruments

The following table presents the amounts of gains and losses on the Company's derivative instruments for fiscal years 2014, 2013, and 2012 and their locations on its consolidated statements of operations (in thousands):

 
   Years Ended March 31,  
 
   Amount of
Gain (Loss) Deferred as
a Component of
Accumulated Other
Comprehensive Loss		   Amount of Gain (Loss)
Reclassified from
Accumulated Other
Comprehensive Loss
to Costs of Goods Sold		   Amount of
Gain (Loss)
Immediately Recognized
in Other Income
(Expense), Net		  
 
   2014   2013   2012   2014   2013   2012   2014   2013   2012  

Designed as hedging instruments:

                                                        

Cash flow hedges

   $ (1,025 ) $ 566   $ 2,916   $ 2,472   $ 1,756   $ (421 ) $ (126 ) $ 275   $ (198 )

Not designed as hedging instruments:

                                                        

Foreign exchange forward contract

     —     —     —     —     —     —     (464 )   (848 )   (350 )

Foreign exchange swap contract

     —     —     —     —     —     —     1,288     1,176     (1,884 )
                                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

     —     —     —     —     —     —     824     328     (2,234 )
                                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

   $ (1,025 ) $ 566   $ 2,916   $ 2,472   $ 1,756   $ (421 ) $ 698   $ 603   $ (2,432 )
                                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​