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Earnings Per Share (Tables)
 9 Months Ended
Oct. 31, 2011
Earnings Per Share [Abstract]  
Reconciliation of numerators and denominators for basic and diluted EPS computations
                                 
    Three Months Ended October 31,     Nine Months Ended October 31,  
(in thousands)   2011     2010     2011     2010  
Net earnings for basic and diluted EPS
  $ 89,689     $ 55,079     $ 260,795     $ 187,179  
 
                       
Weighted-average shares for basic EPS
    127,210       126,176       127,614       126,591  
Incremental shares based upon the assumed exercise of stock options and unvested restricted stock units
    1,602       1,729       1,715       1,686  
 
                       
Weighted-average shares for diluted EPS
    128,812       127,905       129,329       128,277