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Supplementary Financial Data (Unaudited) (Tables) | 12 Months Ended
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Sep. 30, 2020
Quarterly Financial Information Disclosure [Abstract] |
Selected Unaudited Consolidated Financial Results | The following table presents selected unaudited consolidated financial results for each of the eight quarters in the two-year period ended September 30, 2020. In the opinion of management, this unaudited information has been prepared on the same basis as the audited information and includes all adjustments (consisting of only normal recurring adjustments, except as noted below) necessary for a fair statement of the consolidated financial information for the period presented.
| Quarter Ended
| September 30, 2020 |  | June 30, 2020 |  | March 31, 2020 |  | December 31, 2019
| (In thousands, except per share data)
Revenues | $ | 374,356 |  |  | $ | 313,731 |  |  | $ | 307,971 |  |  | $ | 298,504 |
Cost of revenues (1) | 93,676 |  |  | 88,569 |  |  | 88,139 |  |  | 90,758 |
Gross profit | 280,680 |  |  | 225,162 |  |  | 219,832 |  |  | 207,746 |
Net income | $ | 59,126 |  |  | $ | 64,076 |  |  | $ | 58,288 |  |  | $ | 54,921 |
Earnings per share (2): |  |  |  |  |  |  |
Basic | $ | 2.04 |  |  | $ | 2.21 |  |  | $ | 2.00 |  |  | $ | 1.89 |
Diluted | $ | 1.98 |  |  | $ | 2.15 |  |  | $ | 1.94 |  |  | $ | 1.82 |
Shares used in computing earnings per share: |  |  |  |  |  |  |
Basic | 29,045 |  |  | 29,005 |  |  | 29,194 |  |  | 29,025 |
Diluted | 29,833 |  |  | 29,744 |  |  | 29,985 |  |  | 30,169 |
| Quarter Ended
| September 30, 2019 |  | June 30, 2019 |  | March 31, 2019 |  | December 31, 2018
| (In thousands, except per share data)
Revenues | $ | 305,344 |  |  | $ | 314,249 |  |  | $ | 278,234 |  |  | $ | 262,256 |
Cost of revenues (1) | 87,996 |  |  | 87,215 |  |  | 85,568 |  |  | 76,066 |
Gross profit | 217,348 |  |  | 227,034 |  |  | 192,666 |  |  | 186,190 |
Net income | $ | 54,584 |  |  | $ | 64,152 |  |  | $ | 33,381 |  |  | $ | 40,007 |
Earnings per share (2): |  |  |  |  |  |  |
Basic | $ | 1.89 |  |  | $ | 2.21 |  |  | $ | 1.15 |  |  | $ | 1.38 |
Diluted | $ | 1.80 |  |  | $ | 2.12 |  |  | $ | 1.10 |  |  | $ | 1.32 |
Shares used in computing earnings per share: |  |  |  |  |  |  |
Basic | 28,918 |  |  | 28,967 |  |  | 29,074 |  |  | 28,961 |
Diluted | 30,290 |  |  | 30,292 |  |  | 30,259 |  |  | 30,336 |
(1) | Cost of revenues excludes amortization expense of $0.3 million, $0.4 million, $0.5 million, $0.6 million, $0.5 million, $0.5 million, $0.5 million and $0.5 million for the quarters ended September 30, 2020, June 30, 2020, March 31, 2020, December 31, 2019, September 30, 2019, June 30, 2019, March 31, 2019 and December 31, 2018, respectively.
(2) Earnings per share is computed independently for each of the quarters presented. Therefore, the sum of the quarterly per share amounts may not equal the totals for the respective years.

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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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