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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Sep. 30, 2020
Quarterly Financial Information Disclosure [Abstract] |
Summary of Quarterly Financial Information | The following table sets forth certain unaudited quarterly financial data for each of our last eight quarters. The information has been derived from unaudited financial statements that we believe reflect all adjustments, consisting only of normal recurring adjustments, necessary for the fair presentation of such quarterly financial information.
|  | December 31, 2018 |  |  | March 31, 2019 |  |  | June 30, 2019 |  |  | September 30, 2019 |  |  | December 31, 2019 |  |  | March 31, 2020 |  |  | June 30, 2020 |  |  | September 30, 2020 |
Revenue |  | $ | 241,937 |  |  | $ | 303,586 |  |  | $ | 383,494 |  |  | $ | 308,136 |  |  | $ | 304,172 |  |  | $ | 308,475 |  |  | $ | 498,304 |  |  | $ | 398,762 |
Cost of sales |  |  | 178,459 |  |  |  | 229,384 |  |  |  | 285,784 |  |  |  | 220,694 |  |  |  | 224,154 |  |  |  | 229,699 |  |  |  | 374,851 |  |  |  | 282,296 |
Gross profit |  |  | 63,478 |  |  |  | 74,202 |  |  |  | 97,710 |  |  |  | 87,442 |  |  |  | 80,018 |  |  |  | 78,776 |  |  |  | 123,453 |  |  |  | 116,466 |
Selling, general and administrative expenses |  |  | 54,492 |  |  |  | 63,976 |  |  |  | 68,968 |  |  |  | 74,864 |  |  |  | 64,386 |  |  |  | 69,060 |  |  |  | 74,838 |  |  |  | 83,714 |
Income from operations |  |  | 8,986 |  |  |  | 10,226 |  |  |  | 28,742 |  |  |  | 12,578 |  |  |  | 15,632 |  |  |  | 9,716 |  |  |  | 48,615 |  |  |  | 32,752 |
Interest expense |  |  | 2,516 |  |  |  | 3,033 |  |  |  | 2,936 |  |  |  | 3,094 |  |  |  | 3,344 |  |  |  | 3,013 |  |  |  | 2,133 |  |  |  | 785 |
Income before income income tax provision |  |  | 6,470 |  |  |  | 7,193 |  |  |  | 25,806 |  |  |  | 9,484 |  |  |  | 12,288 |  |  |  | 6,703 |  |  |  | 46,482 |  |  |  | 31,967 |
Income tax provision |  |  | 1,560 |  |  |  | 1,890 |  |  |  | 6,719 |  |  |  | 2,799 |  |  |  | 3,229 |  |  |  | 1,638 |  |  |  | 11,555 |  |  |  | 6,384 |
Net income |  | $ | 4,910 |  |  | $ | 5,303 |  |  | $ | 19,087 |  |  | $ | 6,685 |  |  | $ | 9,059 |  |  | $ | 5,065 |  |  | $ | 34,927 |  |  | $ | 25,583 |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted |  | $ | 0.21 |  |  | $ | 0.23 |  |  | $ | 0.84 |  |  | $ | 0.31 |  |  | $ | 0.41 |  |  | $ | 0.23 |  |  | $ | 1.58 |  |  | $ | 1.13 |
Weighted average number of shares: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted |  |  | 23,400,685 |  |  |  | 23,417,688 |  |  |  | 22,821,202 |  |  |  | 21,896,257 |  |  |  | 21,890,065 |  |  |  | 21,960,285 |  |  |  | 22,045,900 |  |  |  | 22,604,060 |

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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=121640914&loc=d3e1280-108306 + Details
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