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Earnings Per Share ("EPS") (Tables)
 12 Months Ended
Jan. 31, 2017
Earnings Per Share (EPS) [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The composition of basic and diluted EPS (in thousands, except per share data) is as follows:
Year ended January 31:
 
2017
 
2016
 
2015
Net income
 
$
195,095

 
$
265,736

 
$
175,172

 
 
 
 
 
 
 
Weighted average common shares - basic
 
35,194

 
35,898

 
38,172

Effect of dilutive securities:
 
 
 
 
 
 
Equity-based awards
 
234

 
199

 
182

Weighted average common shares - diluted
 
35,428

 
36,097

 
38,354

 
 
 
 
 
 
 
Earnings per share
 
 
 
 
 
 
Basic
 
$
5.54

 
$
7.40

 
$
4.59

Diluted
 
$
5.51

 
$
7.36

 
$
4.57


For the fiscal year ended January 31, 2017, there were 5,191 shares excluded from the computation of diluted earnings per share because their effect would have been antidilutive. For the fiscal years ended January 31, 2016 and 2015, there were no shares excluded from the computation of diluted earnings per share because their effect would have been antidilutive.