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COMPUTATION OF EARNINGS PER COMMON SHARE (Tables)
 9 Months Ended
Dec. 31, 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 nine months ended December 31, 2011 and 2010:
 
 
Three Months Ended
 
Nine Months Ended
 
 
December 31,
 
December 31,
(in thousands, except per share data)
 
2011
 
2010
 
2011
 
2010
Numerator:
 
 
 
 
 
 
 
 
Net income
 
$
30,898

 
$
31,552

 
$
85,150

 
$
82,927

 
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 

 
 
 
 

Weighted average common shares-basic
 
42,541

 
47,649

 
44,623

 
47,621

Dilutive effect of employee equity incentive plans
 
1,099

 
1,782

 
1,234

 
1,650

Weighted average common shares-diluted
 
43,640

 
49,431

 
45,857

 
49,271

 
 
 
 
 
 
 
 
 
Earnings per common share-basic
 
$
0.73

 
$
0.66

 
$
1.91

 
$
1.74

 
 
 
 
 
 
 
 
 
Earnings per common share-diluted
 
$
0.71

 
$
0.64

 
$
1.86

 
$
1.68

 
 
 
 
 
 
 
 
 
Potentially dilutive securities excluded from earnings per common share-diluted because their effect is anti-dilutive
 
1,092

 
1,321

 
1,458

 
1,607