Long Term Debt, Weighted Average Maturity

No definition available.

Name:	fico_LongTermDebtWeightedAverageMaturity
Namespace Prefix:	fico_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of Series

+ References

No definition available.

+ Details

Name:	fico_NumberOfSeries
Namespace Prefix:	fico_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13476-108611

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16(a))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

+ Details

Name:	us-gaap_SeniorNotes
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentAxis=fico_SeniorNotesJulyTwentyTenMember
Namespace Prefix:
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Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=fico_SeniorNotesMayTwentyZeroEightMember
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Senior Notes - Additional Information (Detail) (USD $)	0 Months Ended
Senior Notes - Additional Information (Detail) (USD $)	May 07, 2008	Jul. 14, 2010	Dec. 31, 2014	Sep. 30, 2014
Debt Instrument [Line Items]
Senior Notes, weighted average interest rate			1.295%us-gaap_DebtWeightedAverageInterestRate
Carrying value of Senior Notes			$ 447,000,000us-gaap_SeniorNotes	$ 447,000,000us-gaap_SeniorNotes
Fair value of Senior Notes			464,500,000us-gaap_DebtInstrumentFairValue	462,700,000us-gaap_DebtInstrumentFairValue
May 2008 senior notes
Debt Instrument [Line Items]
Senior Notes issued in a private placement to a group of institutional investors	275,000,000
Number of series of Senior Notes issued	4
Senior Notes, weighted average interest rate	7.00%
Senior Notes, weighted average maturity (in years)	9 years
May 2008 senior notes \| Minimum
Debt Instrument [Line Items]
Senior Notes, maturity (in years)	5 years
May 2008 senior notes \| Maximum
Debt Instrument [Line Items]
Senior Notes, maturity (in years)	10 years
July 2010 senior notes
Debt Instrument [Line Items]
Senior Notes issued in a private placement to a group of institutional investors		$ 245,000,000
Number of series of Senior Notes issued		4
Senior Notes, weighted average interest rate		5.20%
Senior Notes, weighted average maturity (in years)		8 years
July 2010 senior notes \| Minimum
Debt Instrument [Line Items]
Senior Notes, maturity (in years)		6 years
July 2010 senior notes \| Maximum
Debt Instrument [Line Items]
Senior Notes, maturity (in years)		10 years