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Supplementary Financial Data (Unaudited) | 12 Months Ended
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Sep. 30, 2014
Quarterly Financial Information Disclosure [Abstract] |
Supplementary Financial Data (Unaudited) | Supplementary Financial Data (Unaudited) The following table presents selected unaudited consolidated financial results for each of the eight quarters in the two-year period ended September 30, 2014. 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, 2014 |  | June 30, 2014 |  | March 31, 2014 |  | December 31, 2013
| (In thousands, except per share data)
Revenues | $ | 221,570 |  |  | $ | 197,610 |  |  | $ | 185,462 |  |  | $ | 184,343 |
Cost of revenues (2) | 71,026 |  |  | 62,752 |  |  | 58,183 |  |  | 57,319 |
Gross profit | 150,544 |  |  | 134,858 |  |  | 127,279 |  |  | 127,024 |
Net income | $ | 36,603 |  |  | $ | 20,548 |  |  | $ | 20,751 |  |  | $ | 16,977 |
Earnings per share (1): |  |  |  |  |  |  |
Basic | $ | 1.14 |  |  | $ | 0.60 |  |  | $ | 0.60 |  |  | $ | 0.49 |
Diluted | $ | 1.10 |  |  | $ | 0.58 |  |  | $ | 0.59 |  |  | $ | 0.47 |
Shares used in computing earnings per share: |  |  |  |  |  |  |
Basic | 32,123 |  |  | 34,210 |  |  | 34,500 |  |  | 34,699 |
Diluted | 33,217 |  |  | 35,162 |  |  | 35,311 |  |  | 35,820 |
| Quarter Ended
| September 30, 2013 |  | June 30, 2013 |  | March 31, 2013 |  | December 31, 2012
| (In thousands, except per share data)
Revenues | $ | 190,327 |  |  | $ | 183,772 |  |  | $ | 179,325 |  |  | $ | 190,020 |
Cost of revenues (2) | 56,809 |  |  | 57,655 |  |  | 58,856 |  |  | 56,148 |
Gross profit | 133,518 |  |  | 126,117 |  |  | 120,469 |  |  | 133,872 |
Net income | $ | 28,557 |  |  | $ | 19,622 |  |  | $ | 18,495 |  |  | $ | 23,421 |
Earnings per share (1): |  |  |  |  |  |  |
Basic | $ | 0.81 |  |  | $ | 0.55 |  |  | $ | 0.52 |  |  | $ | 0.67 |
Diluted | $ | 0.79 |  |  | $ | 0.54 |  |  | $ | 0.51 |  |  | $ | 0.65 |
Shares used in computing earnings per share: |  |  |  |  |  |  |
Basic | 35,132 |  |  | 35,499 |  |  | 35,664 |  |  | 35,043 |
Diluted | 36,151 |  |  | 36,385 |  |  | 36,492 |  |  | 36,151 |
(1) | 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.
(2) | Cost of revenues excludes amortization expense of $1.9 million, $1.9 million, $1.8 million, $1.8 million, $1.7 million, $1.7 million, $1.7 million and $1.5 million for the quarters ended September 30, 2014, June 30, 2014, March 31, 2014, December 31, 2013, September 30, 2013, June 30, 2013, March 31, 2013 and December 31, 2012, respectively.

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- Definition The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e765-108305 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e725-108305 Reference 3: 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=25249566&loc=d3e1280-108306 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section G -Subsection 1 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 302 -Paragraph a + Details
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