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Selected Unaudited Consolidated Financial Results (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 221,570 $ 197,610 $ 185,462 $ 184,343 $ 190,327 $ 183,772 $ 179,325 $ 190,020 $ 788,985 $ 743,444 $ 676,423
Cost of revenues 71,026 [1] 62,752 [1] 58,183 [1] 57,319 [1] 56,809 [1] 57,655 [1] 58,856 [1] 56,148 [1] 249,281 [2] 229,468 [2] 197,947 [2]
Gross profit 150,544 134,858 127,279 127,024 133,518 126,117 120,469 133,872      
Net income $ 36,603 $ 20,548 $ 20,751 $ 16,977 $ 28,557 $ 19,622 $ 18,495 $ 23,421 $ 94,879 $ 90,095 $ 92,004
Earnings per share:                      
Basic (in dollars per share) $ 1.14 [3] $ 0.60 [3] $ 0.60 [3] $ 0.49 [3] $ 0.81 [3] $ 0.55 [3] $ 0.52 [3] $ 0.67 [3] $ 2.80 $ 2.55 $ 2.64
Diluted (in dollars per share) $ 1.10 [3] $ 0.58 [3] $ 0.59 [3] $ 0.47 [3] $ 0.79 [3] $ 0.54 [3] $ 0.51 [3] $ 0.65 [3] $ 2.72 $ 2.48 $ 2.55
Shares used in computing earnings per share:                      
Basic weighted-average shares 32,123 34,210 34,500 34,699 35,132 35,499 35,664 35,043 33,870 35,332 34,909
Diluted (shares) 33,217 35,162 35,311 35,820 36,151 36,385 36,492 36,151 34,864 36,292 36,063
[1] 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.
[2] Cost of revenues and selling, general and administrative expenses exclude the amortization of intangible assets. See Note 7 to the consolidated financial statements.
[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.