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Equity Incentive Plans (Tables)
3 Months Ended
Sep. 30, 2011
Notes to Financial Statements [Abstract] 
Share-based compensation expense
The following table presents the details of the Company's share-based compensation expense (amounts in thousands):

 
Three Months Ended
 
Six Months Ended
 
 
September 30,
 
September 30,
 
 
2011
 
2010
 
2011
 
2010
 
Cost of sales
$
1,608

(1) 
$
1,743

(1) 
$
3,007

(1) 
$
3,708

(1) 
Research and development
3,556

 
3,025

 
6,969

 
6,192

 
Selling, general and administrative
4,320

 
4,157

 
8,532

 
8,476

 
Pre-tax effect of share-based compensation
9,484

 
8,925

 
18,508

 
18,376

 
Income tax benefit
1,226

 
1,114

 
2,394

 
2,276

 
Net income effect of share-based compensation
$
8,258

 
$
7,811

 
$
16,114

 
$
16,100