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Unaudited Quarterly Financial Information (Tables) | 12 Months Ended
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Jul. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information |
|  | Quarters
|  | First |  | Second |  | Third |  | Fourth |  | Total
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 income |  | 25,836 |  |  | 4,273 |  |  | 26,000 |  |  | 34,951 |  |  | 91,060 |
Net income 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 |
Fiscal 2019 |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 293,196 |  |  | $ | 282,426 |  |  | $ | 289,745 |  |  | $ | 295,278 |  |  | $ | 1,160,645 |
Gross margin |  | 146,539 |  |  | 139,810 |  |  | 145,749 |  |  | 146,580 |  |  | 578,678 |
Operating income |  | 40,622 |  |  | 36,030 |  |  | 39,621 |  |  | 46,155 |  |  | 162,428 |
Net income |  | 30,637 |  |  | 29,227 |  |  | 34,781 |  |  | 36,613 |  |  | 131,258 |
Net income per Class A Nonvoting Common Share: |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.59 |  |  | $ | 0.56 |  |  | $ | 0.66 |  |  | $ | 0.69 |  |  | $ | 2.50 |
Diluted |  | $ | 0.58 |  |  | $ | 0.55 |  |  | $ | 0.65 |  |  | $ | 0.68 |  |  | $ | 2.46 |
* The sum of the quarters does not equal the year-to-date total 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118952077&loc=d3e1280-108306 + Details
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