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Quarterly Information (Tables) | 12 Months Ended
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Jul. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |
Schedule of quarterly financial information |
| 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.

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=35737889&loc=d3e1280-108306 + Details
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