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Supplementary Financial Data (Unaudited) - Selected Unaudited Consolidated Financial Results (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 279,791 |  | $ 259,505 |  | $ 257,858 |  | $ 235,321 |  | $ 253,205 |  | $ 230,986 |  | $ 228,378 |  | $ 219,600 |  | $ 1,032,475 |  | $ 932,169 |  | $ 881,356 |
Cost of revenues | 79,431 | [1] | 78,390 | [1] | 78,519 | [1] | 74,359 | [1] | 75,202 | [1] | 69,793 | [1] | 72,131 | [1] | 69,997 | [1] | 310,699 | [2] | 287,123 | [2] | 265,173 | [2]
Gross profit | 200,360 |  | 181,115 |  | 179,339 |  | 160,962 |  | 178,003 |  | 161,193 |  | 156,247 |  | 149,603 |  |  |  |  |  |  |
Net income | $ 50,480 |  | $ 32,361 |  | $ 32,275 |  | $ 27,299 |  | $ 40,044 |  | $ 25,227 |  | $ 25,084 |  | $ 37,901 |  | $ 142,415 |  | $ 128,256 |  | $ 109,448 |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 1.74 | [3] | $ 1.09 | [3] | $ 1.08 | [3] | $ 0.91 | [3] | $ 1.31 | [3] | $ 0.82 | [3] | $ 0.81 | [3] | $ 1.22 | [3] | $ 4.79 |  | $ 4.16 |  | $ 3.52 |
Diluted (in dollars per share) | $ 1.64 | [3] | $ 1.04 | [3] | $ 1.03 | [3] | $ 0.86 | [3] | $ 1.25 | [3] | $ 0.78 | [3] | $ 0.78 | [3] | $ 1.16 | [3] | $ 4.57 |  | $ 3.98 |  | $ 3.39 |
Shares used in computing earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted-average shares (in shares) | 29,077 |  | 29,708 |  | 29,985 |  | 30,078 |  | 30,534 |  | 30,914 |  | 31,017 |  | 30,989 |  | 29,711 |  | 30,862 |  | 31,129 |
Diluted (in shares) | 30,702 |  | 31,161 |  | 31,300 |  | 31,561 |  | 31,963 |  | 32,224 |  | 32,260 |  | 32,536 |  | 31,180 |  | 32,245 |  | 32,308 |
[1] | Cost of revenues excludes amortization expense of $0.5 million, $0.6 million, $0.6 million, $0.7 million, $1.4 million, $1.7 million, $1.7 million and $1.7 million for the quarters ended September 30, 2018, June 30, 2018, March 31, 2018, December 31, 2017, September 30, 2017, June 30, 2017, March 31, 2017 and December 31, 2016, respectively.
[2] | Cost of revenues and selling, general and administrative expenses exclude the amortization of intangible assets. See Note 7.
[3] | 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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