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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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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.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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