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Nature of Business and Summary of Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Oct. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,160,083 | $ 1,000,146 | $ 934,983 |
Cost of revenues | $ 87,996 | [1] | $ 87,215 | [1] | $ 85,568 | [1] | $ 76,066 | [1] | $ 79,962 | [1] | $ 79,011 | [1] | $ 79,493 | [1] | $ 74,432 | [1] | 336,845 | 312,898 | 287,607 |
Selling, general and administrative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 414,086 | 376,912 | 337,167 |
Provision for income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,948 | 30,450 | 22,869 |
Net income | $ 54,584 |  | $ 64,152 |  | $ 33,381 |  | $ 40,007 |  | $ 32,713 |  | $ 29,721 |  | $ 31,169 |  | $ 32,879 |  | 192,124 | 126,482 | 133,414 |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 178,460 | $ 116,556 | $ 143,931 |
Basic earnings per share (in dollars per share) | $ 1.89 | [2] | $ 2.21 | [2] | $ 1.15 | [2] | $ 1.38 | [2] | $ 1.13 | [2] | $ 1.00 | [2] | $ 1.04 | [2] | $ 1.09 | [2] | $ 6.63 | $ 4.26 | $ 4.32 |
Diluted earnings per share (in dollars per share) | $ 1.80 | [2] | $ 2.12 | [2] | $ 1.10 | [2] | $ 1.32 | [2] | $ 1.07 | [2] | $ 0.95 | [2] | $ 1.00 | [2] | $ 1.04 | [2] | $ 6.34 | $ 4.06 | $ 4.14 |
Deferred income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,701 | $ 10,584 | $ (6,248) |
Increase (Decrease) in Operating Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (8,415) | (612) |
Accounting Standards Update 2016-02 | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Lease, Liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 99,000
Operating Lease, Right-of-Use Asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 90,000
As Previously Reported |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,032,475 | 932,169 |
Cost of revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 310,699 | 287,123 |
Selling, general and administrative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 380,362 | 339,796 |
Provision for income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,595 | 23,068 |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 142,415 | 128,256 |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 132,502 | $ 138,773 |
Basic earnings per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.79 | $ 4.16 |
Diluted earnings per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.57 | $ 3.98 |
Deferred income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,729 | $ (6,049) |
Increase (Decrease) in Operating Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (39,493) | 4,347 |
Adjustment | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (32,329) | 2,814 |
Cost of revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,199 | 484 |
Selling, general and administrative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,450) | (2,629) |
Provision for income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (15,145) | (199) |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (15,933) | 5,158 |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (15,946) | $ 5,158 |
Basic earnings per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.53) | $ 0.16 |
Diluted earnings per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.51) | $ 0.16 |
Deferred income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (15,145) | $ (199) |
Increase (Decrease) in Operating Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 31,078 | $ (4,959) |
[1] | Cost of revenues excludes amortization expense of $0.5 million, $0.5 million, $0.5 million, $0.5 million, $0.5 million, $0.6 million, $0.6 million and $0.7 million for the quarters ended September 30, 2019, June 30, 2019, March 31, 2019, December 31, 2018, September 30, 2018, June 30, 2018, March 31, 2018 and December 31, 2017, 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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