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Acquisition (Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands | Jan. 22, 2018 | Oct. 20, 2017 | Mar. 31, 2018 | Sep. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2016
--- | --- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  | $ 155,982 | $ 131,995 | $ 129,921 | $ 109,448
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 |  |  |  |
Accelerated |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash | $ 16,759 |  |  |  |  |
Fair value of contingent consideration on acquired business | 2,300 |  |  |  |  |
Total purchase price consideration | 19,059 |  |  |  |  |
Fair value of net tangible assets acquired | 697 |  |  |  |  |
Goodwill | 6,062 |  |  |  |  |
Total assets acquired and liabilities assumed | 19,059 |  |  |  |  |
Customer relationships | TempAlert |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of identifiable intangible assets acquired |  | 18,300 |  |  |  |
Customer relationships | Accelerated |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of identifiable intangible assets acquired | 6,500 |  |  |  |  |
Purchased and core technology | TempAlert |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of identifiable intangible assets acquired |  | 4,000 |  |  |  |
Purchased and core technology | Accelerated |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of identifiable intangible assets acquired | 3,000 |  |  |  |  |
Trade name and trademarks | TempAlert |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of identifiable intangible assets acquired |  | $ 2,000 |  |  |  |
Trade name and trademarks | Accelerated |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of identifiable intangible assets acquired | 1,000 |  |  |  |  |
Order backlog | Accelerated |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of identifiable intangible assets acquired | $ 1,800 |  |  |  |  |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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