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Unaudited Quarterly Financial Information (Tables) | 12 Months Ended
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Jul. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information |
|  | Quarters
|  | First |  | Second |  | Third |  | Fourth |  | Total
Fiscal 2017 |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 280,176 |  |  | $ | 268,001 |  |  | $ | 275,927 |  |  | $ | 289,212 |  |  | $ | 1,113,316 |
Gross margin |  | 140,358 |  |  | 134,158 |  |  | 139,909 |  |  | 143,867 |  |  | 558,292 |
Operating income |  | 33,208 |  |  | 29,962 |  |  | 31,550 |  |  | 36,295 |  |  | 131,015 |
Net earnings |  | 22,553 |  |  | 25,297 |  |  | 22,553 |  |  | 25,242 |  |  | 95,645 |
Net earnings per Class A Nonvoting Common Share: |  |  |  |  |  |  |  |  |  |
Basic * |  | $ | 0.45 |  |  | $ | 0.50 |  |  | $ | 0.44 |  |  | $ | 0.49 |  |  | $ | 1.87 |
Diluted |  | $ | 0.44 |  |  | $ | 0.49 |  |  | $ | 0.43 |  |  | $ | 0.48 |  |  | $ | 1.84 |
Fiscal 2018 |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 290,151 |  |  | $ | 287,780 |  |  | $ | 298,421 |  |  | $ | 297,499 |  |  | $ | 1,173,851 |
Gross margin |  | 146,065 |  |  | 143,692 |  |  | 151,082 |  |  | 147,452 |  |  | 588,291 |
Operating income |  | 35,411 |  |  | 34,796 |  |  | 37,709 |  |  | 44,780 |  |  | 152,696 |
Net earnings |  | 25,836 |  |  | 4,273 |  |  | 26,000 |  |  | 34,951 |  |  | 91,060 |
Net earnings per Class A Nonvoting Common Share: |  |  |  |  |  |  |  |  |  |
Basic * |  | $ | 0.50 |  |  | $ | 0.08 |  |  | $ | 0.50 |  |  | $ | 0.67 |  |  | $ | 1.76 |
Diluted * |  | $ | 0.49 |  |  | $ | 0.08 |  |  | $ | 0.49 |  |  | $ | 0.66 |  |  | $ | 1.73 |
* The sum of the quarters does not equal the year-to-date total for fiscal 2017 or 2018 due to the quarterly changes in weighted-average shares outstanding.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, 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=84173487&loc=d3e1280-108306 + Details
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