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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (PARENTHETICAL) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Allocated Share-based Compensation Expense $ 8,664 $ 7,856
Cost of Sales [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Allocated Share-based Compensation Expense 1,310 [1] 1,399 [1]
Research and Development Expense [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Allocated Share-based Compensation Expense 4,032 3,413
Selling General And Administrative Member
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Allocated Share-based Compensation Expense $ 4,644 $ 4,212
[1] During the three months ended June 30, 2012, $1.7 million of share-based compensation expense was capitalized to inventory and $1.3 million of previously capitalized share-based compensation expenses in inventory was sold. During the three months ended June 30, 2011, $1.7 million of share-based compensation expense was capitalized to inventory and $1.4 million of previously capitalized share-based compensation expense in inventory was sold.