Quarterly report pursuant to Section 13 or 15(d)

STOCK INCENTIVE PLANS AND SHARE-BASED COMPENSATION (Details)

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STOCK INCENTIVE PLANS AND SHARE-BASED COMPENSATION (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Share-based compensation:        
Share-based compensation $ 3,726 $ 3,805 $ 8,013 $ 6,822
Cost Of Sales [Member]
       
Share-based compensation:        
Share-based compensation 642 568 1,213 1,023
Research and Development Expense [Member]
       
Share-based compensation:        
Share-based compensation 947 1,031 1,847 1,671
Selling and Marketing Expense [Member]
       
Share-based compensation:        
Share-based compensation 1,246 1,213 2,330 1,932
General and Administrative Expense [Member]
       
Share-based compensation:        
Share-based compensation $ 891 $ 993 $ 2,623 $ 2,196