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Business Combinations - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Dec. 11, 2017 | Apr. 30, 2018 | Apr. 30, 2018 | Apr. 30, 2017 | Oct. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |
Payments to acquire businesses, net of cash, cash equivalents and short-term investments |  |  | $ 631,100 |  |
Goodwill |  | $ 3,147,124 | 3,147,124 |  | $ 2,706,974
Payment to acquire business net of cash acquired |  |  | 643,537 | $ 187,624 |
Black Duck Software |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Payments to acquire businesses, net of cash, cash equivalents and short-term investments |  |  | 544,000 |  |
Consideration transfered | $ 565,100 |  | 565,088 |  |
Goodwill |  | 396,346 | 396,346 |  |
Identifiable intangibles assets acquired |  | 178,000 | 178,000 |  |
Acquisition-related costs |  | 1,900 | 13,500 |  |
Fair value of equity awards acquired |  |  | 15,600 |  |
Fair value of assumed equity awards allocated to purchase consideration |  |  | 1,588 |  |
Fair value of stock options assumed |  |  | 14,000 |  |
Series of Individually Immaterial Business Acquisitions |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | 38,400 | 38,400 |  |
Identifiable intangibles assets acquired |  | $ 50,200 | 50,200 |  |
Acquisition-related costs |  |  | 3,300 |  |
Payment to acquire business net of cash acquired |  |  | $ 87,100 |  |
Minimum | Black Duck Software |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Finite-lived intangible asset, useful life |  |  | 1 year |  |
Minimum | Series of Individually Immaterial Business Acquisitions |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Finite-lived intangible asset, useful life |  |  | 1 year |  |
Maximum | Black Duck Software |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Finite-lived intangible asset, useful life |  |  | 10 years |  |
Maximum | Series of Individually Immaterial Business Acquisitions |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Finite-lived intangible asset, useful life |  |  | 7 years |  |

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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 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 of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + 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 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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