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Earnings Per Share (Tables)
 6 Months Ended
Jul. 31, 2013
Earnings Per Share [Abstract]  
Reconciliation of Numerators and Denominators for Basic and Diluted EPS Computations
The following table summarizes the reconciliation of the numerators and denominators for the basic and diluted EPS computations:
 
 
Three Months Ended July 31,
 
Six Months Ended July 31,
(in thousands)
2013
 
2012
 
2013
 
2012
Net earnings for basic and diluted EPS
$
106,781

 
$
91,801

 
$
190,358

 
$
173,335

Weighted-average shares for basic EPS
127,826

 
126,631

 
127,572

 
126,677

Incremental shares based upon the assumed exercise of
   stock options and unvested restricted stock units
945

 
1,032

 
1,034

 
1,243

Weighted-average shares for diluted EPS
128,771

 
127,663

 
128,606

 
127,920