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COMPUTATION OF EARNINGS PER COMMON SHARE (Tables)
6 Months Ended
Sep. 30, 2011
Earnings Per Share [Abstract] 
Computation of Basic and Diluted Earnings per Common Share [Table Text Block]
The following table sets forth the computation of basic and diluted earnings per common share for the three and six months ended September 30, 2011 and 2010:
 
 
Three Months Ended
 
Six Months Ended
 
 
September 30,
 
September 30,
(in thousands, except per share data)
 
2011
 
2010
 
2011
 
2010
Numerator:
 
 
 
 
 
 
 
 
Net income
 
$
27,521

 
$
25,429

 
$
54,252

 
$
51,375

 
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
 
Weighted average common shares-basic
 
44,556

 
47,087

 
45,664

 
47,607

Dilutive effect of employee equity incentive plans
 
1,161

 
1,437

 
1,286

 
1,541

Weighted average common shares-diluted
 
45,717

 
48,524

 
46,950

 
49,148

 
 
 
 
 
 
 
 
 
Earnings per common share-basic
 
$
0.62

 
$
0.54

 
$
1.19

 
$
1.08

 
 
 
 
 
 
 
 
 
Earnings per common share-diluted
 
$
0.60

 
$
0.52

 
$
1.16

 
$
1.05

 
 
 
 
 
 
 
 
 
Potentially dilutive securities excluded from earnings per common share-diluted because their effect is anti-dilutive
 
1,946

 
2,254

 
1,781

 
2,214