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Leases - Additional Information (Detail) $ in Millions	Mar. 31, 2019 USD ($)
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

X

- 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

X

- 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

X

- 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: