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International Business Machines Corporation Information Technology Outsourcing Agreement - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2012
Information Technology Outsourcing Agreement [Line Items]
Services agreement, expected termination fee	$ 3.0
Services agreement, effective termination date	2013-01-31

X

- Definition

Agreement Termination Date

+ References

No definition available.

+ Details

Name:	aciw_AgreementTerminationDate
Namespace Prefix:	aciw_
Data Type:	us-types:dateStringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	aciw_InformationTechnologyOutsourcingAgreementLineItems
Namespace Prefix:	aciw_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Contractual termination fee to be paid by the Company to International Business Machines for the termination of the outsourcing agreement.

+ References

No definition available.

+ Details

Name:	aciw_OutsourcingAgreementTerminationFee
Namespace Prefix:	aciw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration