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Quarterly Information
 12 Months Ended
Jul. 31, 2015
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Information (in thousands, except per share data) (Unaudited)
19 — Quarterly Financial Information (in thousands, except per share data) (Unaudited)(1) 
 
Fiscal quarter
Fiscal year 2015
First
 
Second
 
Third
 
Fourth
Total revenue
$
290,386

 
$
276,258

 
$
297,142

 
$
282,293

Gross margin
122,308

 
114,867

 
127,417

 
118,784

Operating income
82,401

 
80,468

 
94,767

 
86,765

Income before income taxes
82,223

 
80,104

 
88,296

 
81,446

Net income
52,615

 
52,193

 
57,563

 
57,412

Basic net income per common share
$
0.42

 
$
0.41

 
$
0.46

 
$
0.46

Diluted net income per common share
$
0.40

 
$
0.40

 
$
0.44

 
$
0.44


 
Fiscal quarter
Fiscal year 2014
First
 
Second
 
Third
 
Fourth
Total revenue
$
279,883

 
$
286,434

 
$
309,722

 
$
287,450

Gross margin
107,836

 
111,546

 
132,252

 
116,939

Operating income
64,959

 
71,484

 
62,633

 
75,858

Income before income taxes
64,245

 
70,588

 
61,318

 
73,884

Net income
41,422

 
45,345

 
40,877

 
51,043

Basic net income per common share
$
0.33

 
$
0.36

 
$
0.32

 
$
0.41

Diluted net income per common share
$
0.32

 
$
0.35

 
$
0.31

 
$
0.39

 
(1)
Earnings per share were computed independently for each of the periods presented; therefore, the sum of the earnings per share amounts for the quarters may not equal the total for the year.