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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2016 | Apr. 30, 2015
Net sales | $ 286,816 | $ 290,227 | $ 838,519 | $ 883,095
Cost of products sold | 141,373 | 149,228 | 420,835 | 453,732
Gross margin | 145,443 | 140,999 | 417,684 | 429,363
Operating expenses: |  |  |  |
Research and development | 8,865 | 8,928 | 26,531 | 27,507
Selling, general and administrative | 105,794 | 102,952 | 306,678 | 319,796
Restructuring charges | 0 | 4,834 | 0 | 13,991
Total operating expenses | 114,659 | 116,714 | 333,209 | 361,294
Operating income | 30,784 | 24,285 | 84,475 | 68,069
Other income (expense): |  |  |  |
Investment and other income (expense) | 721 | 434 | (1,030) | 968
Interest expense | (1,838) | (2,503) | (6,119) | (8,394)
Earnings from continuing operations before income taxes | 29,667 | 22,216 | 77,326 | 60,643
Income tax expense | 8,686 | 5,003 | 22,352 | 16,347
Earnings from continuing operations | 20,981 | 17,213 | 54,974 | 44,296
Loss from discontinued operations, net of income taxes | 0 | 0 | 0 | (1,915)
Net earnings | $ 20,981 | $ 17,213 | $ 54,974 | $ 42,381
Weighted average common shares outstanding (in thousands): |  |  |  |
Weighted average common shares outstanding, basic (in thousands): | 50,251 | 51,301 | 50,602 | 51,275
Weighted average common shares outstanding, diluted (in thousands): | 50,505 | 51,450 | 50,747 | 51,370
Class A nonvoting common stock |  |  |  |
Earnings Per Share |  |  |  |
Earnings from continuing operations per basic share | $ 0.42 | $ 0.34 | $ 1.09 | $ 0.86
Earnings from continuing operations per diluted share | 0.42 | 0.33 | 1.08 | 0.86
Earnings (loss) from discontinued operations per basic share | 0.00 | 0.00 | 0.00 | (0.03)
Earnings (loss) from discontinued operations per diluted share | 0.00 | 0.00 | 0.00 | (0.03)
Net earnings per share, basic | 0.42 | 0.34 | 1.09 | 0.83
Net earnings per share, diluted | 0.42 | 0.33 | 1.08 | 0.83
Dividends | $ 0.20 | $ 0.20 | $ 0.61 | $ 0.60
Class B voting common stock |  |  |  |
Other income (expense): |  |  |  |
Earnings from continuing operations | $ 20,981 | $ 17,213 | $ 54,190 | $ 43,501
Earnings Per Share |  |  |  |
Earnings from continuing operations per basic share | $ 0.42 | $ 0.34 | $ 1.07 | $ 0.85
Earnings from continuing operations per diluted share | 0.42 | 0.33 | 1.07 | 0.85
Earnings (loss) from discontinued operations per basic share | 0.00 | 0.00 | 0.00 | (0.04)
Earnings (loss) from discontinued operations per diluted share | 0.00 | 0.00 | 0.00 | (0.04)
Net earnings per share, basic | 0.42 | 0.34 | 1.07 | 0.81
Net earnings per share, diluted | 0.42 | 0.33 | 1.07 | 0.81
Dividends | $ 0.20 | $ 0.20 | $ 0.59 | $ 0.58

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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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