Name:	aciw_DefinedContributionPlanEmployeeMaximumContributionPercentage
Namespace Prefix:	aciw_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Company's contribution of eligible compensation for those employed after December 31, 2000.

No definition available.

Name:	aciw_DefinedContributionPlanEmployerContributionPercentage
Namespace Prefix:	aciw_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Company's contribution of eligible compensation for employees employed at December 31, 2000.

No definition available.

Name:	aciw_DefinedContributionPlanEmployerMinimumContributionPercentageForEmployeesEmployed
Namespace Prefix:	aciw_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Defined contribution plan employers contribution maximum.

No definition available.

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

Schedule Of Defined Contribution Plans Disclosures [Line Items]

No definition available.

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

Amount of cost for defined contribution plan.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Percentage employer matches of the employee's percentage contribution matched.

No definition available.

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Maximum amount the employee may contribute to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Name:	us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_ForeignPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RetirementPlanTypeAxis=aciw_EmployeesUnderAgeFiftyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RetirementPlanTypeAxis=aciw_EmployeesTurningAgeFiftyOrMoreMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RetirementPlanTypeAxis=aciw_EmployeeHiredPriorToDecemberOneTwoThousandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RetirementPlanTypeAxis=aciw_EmployeesAgedOverFiftyFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RetirementPlanTypeAxis=aciw_EmployeeHiredAfterDecemberOneTwoThousandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: