v3.26.1
REVENUES - Schedule of Disaggregation of Revenues (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2026
Apr. 30, 2025
Apr. 30, 2026
Apr. 30, 2025
Revenue from External Customer [Line Items]        
Revenues $ 2,290.0 $ 2,111.7 $ 4,533.5 $ 4,226.6
Facility Solutions        
Revenue from External Customer [Line Items]        
Revenues 1,672.0 1,609.2 3,349.3 3,206.5
Janitorial        
Revenue from External Customer [Line Items]        
Revenues 1,309.8 1,296.5 2,642.7 2,572.3
Aviation Services        
Revenue from External Customer [Line Items]        
Revenues 150.3 116.4 281.6 233.7
Parking and Transportation        
Revenue from External Customer [Line Items]        
Revenues 211.9 196.3 424.9 400.5
Engineering and Infrastructure Solutions        
Revenue from External Customer [Line Items]        
Revenues 618.0 502.5 1,184.2 1,020.1
Operations and Maintenance        
Revenue from External Customer [Line Items]        
Revenues 347.6 292.4 682.5 607.7
Building & Energy Solutions        
Revenue from External Customer [Line Items]        
Revenues 270.4 210.2 501.7 412.4
B&I        
Revenue from External Customer [Line Items]        
Revenues 1,015.8 1,015.5 2,080.9 2,038.4
B&I | Facility Solutions        
Revenue from External Customer [Line Items]        
Revenues 811.5 812.8 1,649.3 1,615.1
B&I | Janitorial        
Revenue from External Customer [Line Items]        
Revenues 704.1 706.6 1,434.8 1,404.4
B&I | Aviation Services        
Revenue from External Customer [Line Items]        
Revenues 0.0 0.0 0.0 0.0
B&I | Parking and Transportation        
Revenue from External Customer [Line Items]        
Revenues 107.3 106.2 214.6 210.7
B&I | Engineering and Infrastructure Solutions        
Revenue from External Customer [Line Items]        
Revenues 204.4 202.7 431.6 423.4
B&I | Operations and Maintenance        
Revenue from External Customer [Line Items]        
Revenues 203.1 202.7 428.9 423.4
B&I | Building & Energy Solutions        
Revenue from External Customer [Line Items]        
Revenues 1.2 0.0 2.7 0.0
M&D        
Revenue from External Customer [Line Items]        
Revenues 463.8 398.1 886.1 792.4
M&D | Facility Solutions        
Revenue from External Customer [Line Items]        
Revenues 359.5 351.4 712.0 692.9
M&D | Janitorial        
Revenue from External Customer [Line Items]        
Revenues 337.4 339.3 671.2 667.5
M&D | Aviation Services        
Revenue from External Customer [Line Items]        
Revenues 0.0 0.0 0.0 0.0
M&D | Parking and Transportation        
Revenue from External Customer [Line Items]        
Revenues 22.1 12.1 40.8 25.4
M&D | Engineering and Infrastructure Solutions        
Revenue from External Customer [Line Items]        
Revenues 104.3 46.7 174.1 99.4
M&D | Operations and Maintenance        
Revenue from External Customer [Line Items]        
Revenues 102.5 46.7 172.2 99.4
M&D | Building & Energy Solutions        
Revenue from External Customer [Line Items]        
Revenues 1.8 0.0 1.9 0.0
Aviation        
Revenue from External Customer [Line Items]        
Revenues 310.8 260.1 608.5 530.2
Aviation | Facility Solutions        
Revenue from External Customer [Line Items]        
Revenues 296.4 246.9 580.0 503.9
Aviation | Janitorial        
Revenue from External Customer [Line Items]        
Revenues 63.7 52.7 129.0 105.9
Aviation | Aviation Services        
Revenue from External Customer [Line Items]        
Revenues 150.3 116.4 281.6 233.7
Aviation | Parking and Transportation        
Revenue from External Customer [Line Items]        
Revenues 82.4 77.9 169.4 164.2
Aviation | Engineering and Infrastructure Solutions        
Revenue from External Customer [Line Items]        
Revenues 14.4 13.2 28.6 26.3
Aviation | Operations and Maintenance        
Revenue from External Customer [Line Items]        
Revenues 14.4 13.2 28.6 26.3
Aviation | Building & Energy Solutions        
Revenue from External Customer [Line Items]        
Revenues 0.0 0.0 0.0 0.0
Education        
Revenue from External Customer [Line Items]        
Revenues 232.2 227.8 460.9 453.2
Education | Facility Solutions        
Revenue from External Customer [Line Items]        
Revenues 204.6 198.0 408.0 394.6
Education | Janitorial        
Revenue from External Customer [Line Items]        
Revenues 204.5 197.9 407.8 394.4
Education | Aviation Services        
Revenue from External Customer [Line Items]        
Revenues 0.0 0.0 0.0 0.0
Education | Parking and Transportation        
Revenue from External Customer [Line Items]        
Revenues 0.1 0.1 0.2 0.2
Education | Engineering and Infrastructure Solutions        
Revenue from External Customer [Line Items]        
Revenues 27.6 29.8 52.9 58.5
Education | Operations and Maintenance        
Revenue from External Customer [Line Items]        
Revenues 27.6 29.8 52.9 58.5
Education | Building & Energy Solutions        
Revenue from External Customer [Line Items]        
Revenues 0.0 0.0 0.0 0.0
Technical Solutions        
Revenue from External Customer [Line Items]        
Revenues 267.3 210.2 497.1 412.4
Technical Solutions | Facility Solutions        
Revenue from External Customer [Line Items]        
Revenues 0.0 0.0 0.0 0.0
Technical Solutions | Janitorial        
Revenue from External Customer [Line Items]        
Revenues 0.0 0.0 0.0 0.0
Technical Solutions | Aviation Services        
Revenue from External Customer [Line Items]        
Revenues 0.0 0.0 0.0 0.0
Technical Solutions | Parking and Transportation        
Revenue from External Customer [Line Items]        
Revenues 0.0 0.0 0.0 0.0
Technical Solutions | Engineering and Infrastructure Solutions        
Revenue from External Customer [Line Items]        
Revenues 267.3 210.2 497.1 412.4
Technical Solutions | Operations and Maintenance        
Revenue from External Customer [Line Items]        
Revenues 0.0 0.0 0.0 0.0
Technical Solutions | Building & Energy Solutions        
Revenue from External Customer [Line Items]        
Revenues $ 267.3 $ 210.2 $ 497.1 $ 412.4