GOODWILL: (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Dec. 31, 2014	Mar. 31, 2014
Goodwill
Goodwill at the beginning of the period	$ 358,384us-gaap_Goodwill
LiveRamp acquisition	215,967us-gaap_GoodwillAcquiredDuringPeriod
Change in foreign currency translation adjustment	(1,762)us-gaap_GoodwillTranslationAdjustments
Goodwill at the end of the period	572,589us-gaap_Goodwill
Marketing and Data Services
Goodwill
Goodwill at the beginning of the period	286,876
LiveRamp acquisition	215,967
Change in foreign currency translation adjustment	(1,762)
Goodwill at the end of the period	501,081
Marketing and Data Services \| United States
Goodwill
Goodwill at the end of the period	482,700
Marketing and Data Services \| Australia
Goodwill
Goodwill at the end of the period	11,600
Marketing and Data Services \| China
Goodwill
Goodwill at the end of the period	6,000
Marketing and Data Services \| Brazil
Goodwill
Goodwill at the end of the period	800
IT Infrastructure Management
Goodwill
Goodwill at the beginning of the period		71,508
Goodwill at the end of the period	$ 71,508	$ 71,508

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

+ Details

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

+ Details

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

- Details

Name:	us-gaap_GoodwillRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

+ Details

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

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=acxm_ITInfrastructureManagementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=acxm_MarketingAndDataServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: