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Business Combinations - Additional Information (Details) (USD $) In Thousands, unless otherwise specified | 0 Months Ended |  |
--- | --- | --- | ---
Jan. 12, 2015 | Mar. 31, 2015 | Sep. 30, 2014
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 809,117 us-gaap_Goodwill | $ 779,928 us-gaap_Goodwill
TONBELLER |  |  |
Business Acquisition [Line Items] |  |  |
Common stock acquired (percent) | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = fico_TONBELLERMember |  |
Number of customers (more than a thousand) | 1,000 fico_NumberOfCustomers / us-gaap_BusinessAcquisitionAxis = fico_TONBELLERMember |  |
Weighted average useful life | 4 years 11 months |  |
Goodwill | $ 46,188 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = fico_TONBELLERMember |  |
Completed technology | TONBELLER |  |  |
Business Acquisition [Line Items] |  |  |
Weighted average useful life | 5 years |  |
Customer relationships | TONBELLER |  |  |
Business Acquisition [Line Items] |  |  |
Weighted average useful life | 5 years |  |
Trade names | TONBELLER |  |  |
Business Acquisition [Line Items] |  |  |
Weighted average useful life | 3 years |  |

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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=26713463&loc=d3e16265-109275 + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + 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 -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 + Details
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