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Acquisition (Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands | Jan. 22, 2018 | Oct. 20, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | $ 154,535 | $ 131,995 | $ 109,448
Accelerated Concepts |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash | $ 16,430 |  |  |  |
Fair value of contingent consideration on acquired business | 2,300 |  |  |  |
Total purchase price consideration | 18,730 |  |  |  |
Fair value of net tangible assets acquired | 766 |  |  |  |
Goodwill | 5,664 |  |  |  |
Total assets acquired and liabilities assumed | 18,730 |  |  |  |
TempAlert |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash |  | $ 40,741 |  |  |
Fair value of contingent consideration on acquired business |  | 0 |  |  |
Total purchase price consideration |  | 40,741 |  |  |
Fair value of net tangible assets acquired |  | (1,111) |  |  |
Goodwill |  | 17,552 |  |  |
Total assets acquired and liabilities assumed |  | 40,741 |  |  |
Purchased and Core Technology | Accelerated Concepts |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of identifiable intangible assets acquired | 3,000 |  |  |  |
Purchased and Core Technology | TempAlert |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of identifiable intangible assets acquired |  | 4,000 |  |  |
Customer Relationships | Accelerated Concepts |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of identifiable intangible assets acquired | 6,500 |  |  |  |
Customer Relationships | TempAlert |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of identifiable intangible assets acquired |  | 18,300 |  |  |
Trademarks and Trade Names | Accelerated Concepts |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of identifiable intangible assets acquired | 1,000 |  |  |  |
Trademarks and Trade Names | TempAlert |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of identifiable intangible assets acquired |  | $ 2,000 |  |  |
Order backlog | Accelerated Concepts |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of identifiable intangible assets acquired | $ 1,800 |  |  |  |

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