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Acquisitions Acquisitions (Purchase Price Allocation) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 02, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 2,847 |  |
Payments to Acquire Businesses, Net of Cash Acquired |  | $ 4,960 | $ 165,802 | $ 98,411
ColdLight [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill |  |  |  | 85,300
Identifiable intangible assets |  |  |  | 17,600
Cash |  |  |  | 1,300
Less: cash acquired |  |  |  | (1,300)
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  | $ 98,600
Vuforia [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill |  |  | 23,316 |
Identifiable intangible assets |  |  | 41,200 |
Cash |  |  | 4,466 |
Other assets and liabilities, net |  |  | 261 |
Total allocation of purchase price consideration |  |  | 69,243 |
Less: cash acquired |  |  | (4,466) |
Total purchase price allocation, net of cash acquired |  |  | 64,777 |
Less: contingent consideration |  |  | 0 |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | 64,777 |
Kepware [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 77,081 |  | 77,081 |
Identifiable intangible assets |  |  | 34,500 |
Cash |  |  | 590 |
Other assets and liabilities, net |  |  | 4,729 |
Total allocation of purchase price consideration |  |  | 116,900 |
Less: cash acquired |  |  | (590) |
Total purchase price allocation, net of cash acquired |  |  | 116,310 |
Less: contingent consideration |  |  | (16,900) |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | $ 99,410 |

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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 This element represents the amount of any change recognized during the period in the low-end of the estimated range of outcomes (undiscounted) of a liability assumed in a business combination arising from an item of contingent consideration. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + 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 Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References No definition available. + 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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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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