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Revolving Line of Credit - Additional Information (Detail) (USD $) | 3 Months Ended |
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Dec. 31, 2014 | Nov. 30, 2014
Line of Credit Facility [Line Items] |  |
Unsecured revolving line of credit | $ 400,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity | $ 200,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Revolving credit facility, expiration date | Dec. 30, 2019 |
Revolving credit facility, interest rate description | Interest on amounts borrowed under the credit facility is based on (i) a base rate, which is the greater of (a) the prime rate, (b) the Federal Funds rate plus 0.500% and (c) the one-month LIBOR rate plus 1.000%, plus, in each case, an applicable margin, or (ii) an adjusted LIBOR rate plus an applicable margin. The applicable margin for base rate borrowings ranges from 0% to 0.875% and for LIBOR borrowings ranges from 1.000% to 1.875%, and is determined based on our consolidated leverage ratio |
Credit facility restrictive covenant, minimum fixed charge ratio | 2.5 fico_FixedChargeCoverageRatioMinimum |
Credit facility restrictive covenant, maximum consolidated leverage ratio | 3.0 fico_LeverageRatiosMaximum |
Credit facility restrictive covenant, maximum consolidated leverage ratio step up | 3.5 fico_LeverageRatiosStepUpMaximum |
Borrowings outstanding | $ 160,000,000 us-gaap_LineOfCreditFacilityAmountOutstanding |
Interest rate of borrowings outstanding | 1.295%us-gaap_DebtWeightedAverageInterestRate |
Federal Fund Rate |  |
Line of Credit Facility [Line Items] |  |
Debt instrument basis spread on variable rate | 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_VariableRateAxis = fico_FederalFundRateMember |
Libor |  |
Line of Credit Facility [Line Items] |  |
Debt instrument basis spread on variable rate | 1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |
Libor | Minimum |  |
Line of Credit Facility [Line Items] |  |
Debt instrument basis spread on variable rate | 1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |
Libor | Maximum |  |
Line of Credit Facility [Line Items] |  |
Debt instrument basis spread on variable rate | 1.875%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |
Base Rate | Minimum |  |
Line of Credit Facility [Line Items] |  |
Debt instrument basis spread on variable rate | 0.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember |
Base Rate | Maximum |  |
Line of Credit Facility [Line Items] |  |
Debt instrument basis spread on variable rate | 0.875%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember |

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- Definition Fixed Charge Coverage Ratio, Minimum + References No definition available. + Details
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- Definition Leverage Ratios Maximum + References No definition available. + Details
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- Definition Leverage Ratios, Step Up, Maximum + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Balance Type: | credit
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- Details
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- Details
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- Details
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