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Fair Value of Financial Instruments - Additional information (Detail) | 3 Months Ended
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Sep. 30, 2011
Financial Instruments [Line Items] |
Revolving credit facility, interest rate description | LIBOR rate plus a margin ranging from 0.50% to 1.25%
Minimum |
Financial Instruments [Line Items] |
Revolving credit facility, interest rate margin above base rate | 0.50%
Maximum |
Financial Instruments [Line Items] |
Revolving credit facility, interest rate margin above base rate | 1.25%

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- Definition Debt Instrument, Interest Rate, LIBOR Margin + Details
Name: | aciw_DebtInstrumentInterestRateLIBORMargin
Namespace Prefix: | aciw
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Financial Instruments [Line Items] + Details
Name: | aciw_FinancialInstrumentsLineItems
Namespace Prefix: | aciw
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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 Reference 3: 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 + Details
Name: | us-gaap_LineOfCreditFacilityInterestRateDescription
Namespace Prefix: | us-gaap
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration