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Earnings Per Share ("EPS") (Tables)
 12 Months Ended
Jan. 31, 2020
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:
 
2020
 
2019
 
2018
Net income
 
$
374,500

 
$
340,580

 
$
116,641

 
 
 
 
 
 
 
Weighted average common shares - basic
 
36,186

 
38,094

 
37,957

Effect of dilutive securities:
 
 
 
 
 
 
Equity-based awards
 
274

 
223

 
259

Weighted average common shares - diluted
 
36,460

 
38,317

 
38,216

 
 
 
 
 
 
 
Earnings per share
 
 
 
 
 
 
Basic
 
$
10.35

 
$
8.94

 
$
3.07

Diluted
 
$
10.27

 
$
8.89

 
$
3.05


For the fiscal year ended January 31, 2020, there were no shares excluded from the computation of diluted earnings per share because their effect would have been antidilutive. For the fiscal years ended January 31, 2019 and 2018 there were 21,008 and 3,017 shares, respectively, excluded from the computation of diluted earnings per share because their effect would have been antidilutive.