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v3.19.1

Leases - Additional Information (Detail) $ in Millions | Mar. 31, 2019 USD ($)
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Operating leases not yet commenced, office facilities, amount | $ 3.7
Minimum [Member] |
Operating leases not yet commenced, term of contract | 1 year
Maximum [Member] |
Operating leases not yet commenced, term of contract | 7 years

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- Definition Amount of lessee's undiscounted obligation for lease payments for operating leases that have not yet commenced. + References No definition available. + Details
Name: | aciw_LesseeOperatingLeaseLeaseNotYetCommencedPaymentsDue
Namespace Prefix: | aciw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |