    <SEC-DOCUMENT>0000950170-25-020789-index.html : 20250214
    <SEC-HEADER>0000950170-25-020789.hdr.sgml : 20250214
    <ACCEPTANCE-DATETIME>20250214124237
    ACCESSION NUMBER:		0000950170-25-020789
    CONFORMED SUBMISSION TYPE:	DEFA14A
    PUBLIC DOCUMENT COUNT:		4
    FILED AS OF DATE:		20250214
    DATE AS OF CHANGE:		20250214

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			ABM INDUSTRIES INC /DE/
    		CENTRAL INDEX KEY:			0000771497
    		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-TO DWELLINGS & OTHER BUILDINGS [7340]
    		ORGANIZATION NAME:           	07 Trade & Services
    		IRS NUMBER:				941369354
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1031

    	FILING VALUES:
    		FORM TYPE:		DEFA14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-08929
    		FILM NUMBER:		25625851

    	BUSINESS ADDRESS:
    		STREET 1:		ONE LIBERTY PLAZA
    		STREET 2:		7TH FLOOR
    		CITY:			NEW YORK
    		STATE:			NY
    		ZIP:			10006
    		BUSINESS PHONE:		212 297-0200

    	MAIL ADDRESS:
    		STREET 1:		ONE LIBERTY PLAZA
    		STREET 2:		7TH FLOOR
    		CITY:			NEW YORK
    		STATE:			NY
    		ZIP:			10006

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	ABM INDUSTRIES INC
    		DATE OF NAME CHANGE:	19950110

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	AMERICAN BUILDING MAINTENANCE INDUSTRIES INC
    		DATE OF NAME CHANGE:	19920703
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEFA14A
    <SEQUENCE>1
    <FILENAME>abm-20250214.htm
    <DESCRIPTION>DEFA14A
    <TEXT>
    Document 1 - file: abm-20250214.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>img178414695_0.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: img178414695_0.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>img178414695_1.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: img178414695_1.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>img178414695_2.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: img178414695_2.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>