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Earnings Per Share (Tables)
 9 Months Ended
Oct. 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 
 October 31,
 
Nine Months Ended 
 October 31,
(in thousands)
2013
 
2012
 
2013
 
2012
Net earnings for basic and diluted EPS
$
94,610

 
$
63,179

 
$
284,968

 
$
236,514

Weighted-average shares for basic EPS
128,004

 
126,737

 
127,716

 
126,697

Incremental shares based upon the assumed exercise of
   stock options and unvested restricted stock units
970

 
1,165

 
1,013

 
1,217

Weighted-average shares for diluted EPS
128,974

 
127,902

 
128,729

 
127,914