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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Jan. 31, 2020
Quarterly Financial Information Disclosure [Abstract]  
Summary of Quarterly Financial Information
Selected summarized quarterly financial information for fiscal years ended January 31, 2020 and 2019 is as follows (in thousands):
 
Three Months Ended
 
Jan. 31,
2020
 
Oct. 31,
2019
 
Jul. 31,
2019
 
Apr. 30,
2019
 
Jan. 31,
2019
 
Oct. 31,
2018
 
Jul. 31,
2018
 
Apr. 30,
2018
 
(in thousands)
Consolidated Statements of
Income Data:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total revenues
$
311,508

 
$
280,921

 
$
266,900

 
$
244,752

 
$
232,323

 
$
224,731

 
$
209,609

 
$
195,547

Gross profit
217,189

 
207,592

 
196,682

 
179,249

 
167,797

 
163,357

 
150,383

 
135,392

Operating income
60,394

 
80,800

 
73,856

 
71,169

 
62,998

 
63,094

 
52,818

 
43,956

Net income
$
66,182

 
$
82,245

 
$
79,242

 
$
73,449

 
$
71,151

 
$
64,085

 
$
50,286

 
$
44,310

Net income per share:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic
$
0.44

 
$
0.56

 
$
0.54

 
$
0.50

 
$
0.49

 
$
0.44

 
$
0.35

 
$
0.31

Diluted
$
0.42

 
$
0.52

 
$
0.50

 
$
0.47

 
$
0.45

 
$
0.41

 
$
0.32

 
$
0.29