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Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018 | Mar. 14, 2018 | Sep. 30, 2017 | Aug. 30, 2017 | May 25, 2017 | May 08, 2017 | Nov. 07, 2016
--- | --- | --- | --- | --- | --- | --- | --- | ---
Goodwill and Other Intangible Assets |  |  |  |  |  |  |  |
Goodwill | $ 409,215 | $ 381,652 | $ 3,500 | $ 377,900 | $ 10,700 | $ 4,800 | $ 7,500 | $ 30,100
Patents |  |  |  |  |  |  |  |
Goodwill and Other Intangible Assets |  |  |  |  |  |  |  |
Gross carrying amount | 2,100 | 1,800 |  |  |  |  |  |
Less: accumulated amortization | 900 | 800 |  |  |  |  |  |
Net | 1,200 | 1,000 |  |  |  |  |  |
Capitalized software |  |  |  |  |  |  |  |
Goodwill and Other Intangible Assets |  |  |  |  |  |  |  |
Gross carrying amount | 79,700 | 71,300 |  |  |  |  |  |
Less: accumulated amortization | 49,200 | 41,600 |  |  |  |  |  |
Net | 30,500 | 29,700 |  |  |  |  |  |
Customer relationships |  |  |  |  |  |  |  |
Goodwill and Other Intangible Assets |  |  |  |  |  |  |  |
Gross carrying amount | 241,300 | 185,300 |  |  |  |  |  |
Less: accumulated amortization | 59,000 | 47,800 |  |  |  |  |  |
Net | 182,300 | 137,500 |  |  |  |  |  |
Other |  |  |  |  |  |  |  |
Goodwill and Other Intangible Assets |  |  |  |  |  |  |  |
Gross carrying amount | 5,300 | 5,500 |  |  |  |  |  |
Less: accumulated amortization | 2,600 | 2,000 |  |  |  |  |  |
Net | 2,700 | 3,500 |  |  |  |  |  |
Trade names |  |  |  |  |  |  |  |
Goodwill and Other Intangible Assets |  |  |  |  |  |  |  |
Trade names | $ 176,300 | $ 173,700 |  |  |  |  |  |

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- Definition Gross carrying amount before accumulated amortization as of the balance sheet date of the costs pertaining to the exclusive legal rights granted to the owner of the patent to exploit an invention or a process for a period of time specified by law. Such costs may have been expended to directly apply and receive patent rights, or to acquire such rights. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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