    <SEC-DOCUMENT>0001104659-21-122104-index.html : 20211001
    <SEC-HEADER>0001104659-21-122104.hdr.sgml : 20211001
    <ACCEPTANCE-DATETIME>20211001172124
    ACCESSION NUMBER:		0001104659-21-122104
    CONFORMED SUBMISSION TYPE:	8-K/A
    PUBLIC DOCUMENT COUNT:		16
    CONFORMED PERIOD OF REPORT:	20210720
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20211001
    DATE AS OF CHANGE:		20211001

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			ATN International, Inc.
    		CENTRAL INDEX KEY:			0000879585
    		STANDARD INDUSTRIAL CLASSIFICATION:	TELEPHONE COMMUNICATIONS (NO RADIO TELEPHONE) [4813]
    		IRS NUMBER:				470728886
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K/A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-12593
    		FILM NUMBER:		211300017

    	BUSINESS ADDRESS:
    		STREET 1:		500 CUMMINGS CENTER
    		CITY:			BEVERLY
    		STATE:			MA
    		ZIP:			01915
    		BUSINESS PHONE:		9786191300

    	MAIL ADDRESS:
    		STREET 1:		500 CUMMINGS CENTER
    		CITY:			BEVERLY
    		STATE:			MA
    		ZIP:			01915

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	ATLANTIC TELE NETWORK INC /DE
    		DATE OF NAME CHANGE:	19930328
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K/A
    <SEQUENCE>1
    <FILENAME>tm2128022d1_8ka.htm
    <DESCRIPTION>FORM 8-K/A
    <TEXT>
    Document 1 - file: tm2128022d1_8ka.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-23.1
    <SEQUENCE>2
    <FILENAME>tm2128022d1_ex23-1.htm
    <DESCRIPTION>EXHIBIT 23.1
    <TEXT>
    Document 2 - file: tm2128022d1_ex23-1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>3
    <FILENAME>tm2128022d1_ex99-1.htm
    <DESCRIPTION>EXHIBIT 99.1
    <TEXT>
    Document 3 - file: tm2128022d1_ex99-1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.2
    <SEQUENCE>4
    <FILENAME>tm2128022d1_ex99-2.htm
    <DESCRIPTION>EXHIBIT 99.2
    <TEXT>
    Document 4 - file: tm2128022d1_ex99-2.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.3
    <SEQUENCE>5
    <FILENAME>tm2128022d1_ex99-3.htm
    <DESCRIPTION>EXHIBIT 99.3
    <TEXT>
    Document 5 - file: tm2128022d1_ex99-3.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>6
    <FILENAME>atni-20210720.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA
    <TEXT>
    Document 6 - file: atni-20210720.xsd

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.LAB
    <SEQUENCE>7
    <FILENAME>atni-20210720_lab.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE
    <TEXT>
    Document 7 - file: atni-20210720_lab.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.PRE
    <SEQUENCE>8
    <FILENAME>atni-20210720_pre.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE
    <TEXT>
    Document 8 - file: atni-20210720_pre.xml

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    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>9
    <FILENAME>tm2128022d1_8ka_htm.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 9 - file: tm2128022d1_8ka_htm.html

    Document 9 - RAW XML: tm2128022d1_8ka_htm.xml

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    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>10
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 10 - file: R1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EXCEL
    <SEQUENCE>11
    <FILENAME>Financial_Report.xlsx
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 11 - file: Financial_Report.xlsx

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>12
    <FILENAME>Show.js
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 12 - file: Show.js

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>13
    <FILENAME>report.css
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 13 - file: report.css

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>14
    <FILENAME>FilingSummary.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 14 - file: FilingSummary.html

    Document 14 - RAW XML: FilingSummary.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>16
    <FILENAME>MetaLinks.json
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 16 - file: MetaLinks.json

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>17
    <FILENAME>0001104659-21-122104-xbrl.zip
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 17 - file: 0001104659-21-122104-xbrl.zip

    </DOCUMENT>
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