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Acquisitions (Narrative) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 02, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) employee | Sep. 30, 2015 USD ($) | Jan. 12, 2016 USD ($) | Nov. 03, 2015 USD ($)
Acquisition-related cost |  | $ 1,600 | $ 3,500 | $ 8,900 |  |
Payments to Acquire Businesses, Net of Cash Acquired |  | 4,960 | 165,802 | 98,411 |  |
Goodwill acquired |  | 2,847 |  |  |  |
Revenue, Net |  | 1,164,039 | 1,140,533 | 1,255,242 |  |
Costs and Expenses |  | $ 794,122 | 851,882 | 878,892 |  |
ColdLight [Member] |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  | 98,600 |  |
Acquisition of businesses, net cash acquired |  |  |  | 1,300 |  |
Goodwill acquired |  |  |  | 85,300 |  |
Finite-lived Intangible Assets Acquired |  |  |  | 17,600 |  |
Kepware [Member] |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | 99,410 |  |  |
Acquisition of businesses, net cash acquired |  |  | 590 |  |  |
Goodwill acquired | $ 77,081 |  | 77,081 |  |  |
Finite-lived Intangible Assets Acquired |  |  | 34,500 |  |  |
Business acquisition, acquired net assets excluding goodwill, intangible assets and cash |  |  | 4,729 |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, Low |  |  | 16,900 |  |  |
Revenue, Net |  |  | 16,000 |  |  |
Costs and Expenses |  |  | 15,000 |  |  |
Vuforia [Member] |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | 64,777 |  |  |
Acquisition of businesses, net cash acquired |  |  | 4,466 |  |  |
Goodwill acquired |  |  | 23,316 |  |  |
Finite-lived Intangible Assets Acquired |  |  | 41,200 |  |  |
Business acquisition, acquired net assets excluding goodwill, intangible assets and cash |  |  | $ 261 |  |  |
Weighted average useful lives of acquired intangible assets |  |  | 6 years |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, Low |  |  | $ 0 |  |  |
Number of employees in acquired entity | employee |  |  | 80 |  |  |
Purchased Software [Member] |  |  |  |  |  |
Weighted average useful lives of acquired intangible assets |  | 9 years |  |  |  |
Purchased Software [Member] | ColdLight [Member] |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  | $ 13,600 |  |
Weighted average useful lives of acquired intangible assets |  |  |  | 10 years |  |
Purchased Software [Member] | Kepware [Member] |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | $ 28,700 |  |  |
Weighted average useful lives of acquired intangible assets |  |  | 10 years |  |  |
Customer Lists [Member] |  |  |  |  |  |
Weighted average useful lives of acquired intangible assets |  | 10 years |  |  |  |
Customer Lists [Member] | ColdLight [Member] |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  | $ 3,500 |  |
Weighted average useful lives of acquired intangible assets |  |  |  | 9 years |  |
Customer Lists [Member] | Kepware [Member] |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | $ 5,200 |  |  |
Weighted average useful lives of acquired intangible assets |  |  | 10 years |  |  |
Trademarks and Trade Names [Member] | ColdLight [Member] |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  | $ 500 |  |
Trademarks and Trade Names [Member] | Kepware [Member] |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | $ 600 |  |  |
Weighted average useful lives of acquired intangible assets |  |  | 6 years |  |  |
Trademarks [Member] |  |  |  |  |  |
Weighted average useful lives of acquired intangible assets |  | 10 years |  |  |  |
Trademarks [Member] | ColdLight [Member] |  |  |  |  |  |
Weighted average useful lives of acquired intangible assets |  |  |  | 7 years |  |
Line of Credit [Member] |  |  |  |  |  |
Credit facility, borrowings outstanding |  | $ 218,125 | $ 258,125 |  |  |
Line of Credit [Member] | Kepware [Member] |  |  |  |  |  |
Credit facility, borrowings outstanding |  |  |  |  | $ 100,000 |
Line of Credit [Member] | Vuforia [Member] |  |  |  |  |  |
Credit facility, borrowings outstanding |  |  |  |  |  | $ 50,000

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition Total costs of sales and operating expenses for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + 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 (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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