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Quarterly Results of Operations (unaudited) (Tables)
 12 Months Ended
Jul. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Summary of quarterly results of operations
The following is a summary of the quarterly results of operations for fiscal 2018 and 2017:
 
Fiscal 2018
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
Net sales
$
212,766

 
$
213,034

 
$
217,268

 
$
228,854

Cost of sales
112,107

 
111,799

 
112,594

 
121,451

Gross profit
100,659

 
101,235

 
104,674

 
107,403

Gross profit percentage
47.3
%
 
47.5
%
 
48.2
%
 
46.9
%
Net income
$
22,929

 
$
32,488

 
$
18,736

 
$
16,888

Earnings per common share:
 

 
 

 
 

 
 

Basic
$
0.55

 
$
0.78

 
$
0.45

 
$
0.41

Diluted
$
0.55

 
$
0.78

 
$
0.45

 
$
0.41

 
Fiscal 2017
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
Net sales
$
187,725

 
$
184,817

 
$
192,113

 
$
205,502

Cost of sales
98,218

 
96,340

 
100,665

 
107,774

Gross profit
89,507

 
88,477

 
91,448

 
97,728

Gross profit percentage
47.7
%
 
47.9
%
 
47.6
%
 
47.6
%
Net income
$
18,800

 
$
18,070

 
$
17,511

 
$
16,997

Earnings per common share:
 

 
 

 
 

 
 

Basic
$
0.45

 
$
0.43

 
$
0.42

 
$
0.41

Diluted
$
0.45

 
$
0.43

 
$
0.42

 
$
0.41