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REVENUES - Schedule of Disaggregation of Revenues (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Jan. 31, 2025 | Jan. 31, 2024
Revenue from External Customer [Line Items] |  |
Revenues | $ 2,114.9 | $ 2,069.6
Facility Solutions |  |
Revenue from External Customer [Line Items] |  |
Revenues | 1,598.0 | 1,592.2
Janitorial |  |
Revenue from External Customer [Line Items] |  |
Revenues | 1,276.4 | 1,275.8
Aviation Services |  |
Revenue from External Customer [Line Items] |  |
Revenues | 117.3 | 117.4
Parking and Transportation |  |
Revenue from External Customer [Line Items] |  |
Revenues | 204.3 | 199.1
Engineering and Infrastructure Solutions |  |
Revenue from External Customer [Line Items] |  |
Revenues | 516.9 | 477.3
Operations and Maintenance |  |
Revenue from External Customer [Line Items] |  |
Revenues | 314.6 | 311.4
Building & Energy Solutions |  |
Revenue from External Customer [Line Items] |  |
Revenues | 202.3 | 165.9
B&I |  |
Revenue from External Customer [Line Items] |  |
Revenues | 1,022.9 | 1,033.1
B&I | Facility Solutions |  |
Revenue from External Customer [Line Items] |  |
Revenues | 802.3 | 795.7
B&I | Janitorial |  |
Revenue from External Customer [Line Items] |  |
Revenues | 697.8 | 692.4
B&I | Aviation Services |  |
Revenue from External Customer [Line Items] |  |
Revenues | 0.0 | 0.0
B&I | Parking and Transportation |  |
Revenue from External Customer [Line Items] |  |
Revenues | 104.5 | 103.3
B&I | Engineering and Infrastructure Solutions |  |
Revenue from External Customer [Line Items] |  |
Revenues | 220.6 | 237.4
B&I | Operations and Maintenance |  |
Revenue from External Customer [Line Items] |  |
Revenues | 220.6 | 237.4
B&I | Building & Energy Solutions |  |
Revenue from External Customer [Line Items] |  |
Revenues | 0.0 | 0.0
M&D |  |
Revenue from External Customer [Line Items] |  |
Revenues | 394.3 | 400.9
M&D | Facility Solutions |  |
Revenue from External Customer [Line Items] |  |
Revenues | 341.6 | 361.9
M&D | Janitorial |  |
Revenue from External Customer [Line Items] |  |
Revenues | 328.3 | 348.9
M&D | Aviation Services |  |
Revenue from External Customer [Line Items] |  |
Revenues | 0.0 | 0.0
M&D | Parking and Transportation |  |
Revenue from External Customer [Line Items] |  |
Revenues | 13.3 | 13.0
M&D | Engineering and Infrastructure Solutions |  |
Revenue from External Customer [Line Items] |  |
Revenues | 52.7 | 39.0
M&D | Operations and Maintenance |  |
Revenue from External Customer [Line Items] |  |
Revenues | 52.7 | 39.0
M&D | Building & Energy Solutions |  |
Revenue from External Customer [Line Items] |  |
Revenues | 0.0 | 0.0
Education |  |
Revenue from External Customer [Line Items] |  |
Revenues | 225.3 | 220.1
Education | Facility Solutions |  |
Revenue from External Customer [Line Items] |  |
Revenues | 197.2 | 198.1
Education | Janitorial |  |
Revenue from External Customer [Line Items] |  |
Revenues | 197.1 | 198.0
Education | Aviation Services |  |
Revenue from External Customer [Line Items] |  |
Revenues | 0.0 | 0.0
Education | Parking and Transportation |  |
Revenue from External Customer [Line Items] |  |
Revenues | 0.1 | 0.1
Education | Engineering and Infrastructure Solutions |  |
Revenue from External Customer [Line Items] |  |
Revenues | 28.1 | 22.0
Education | Operations and Maintenance |  |
Revenue from External Customer [Line Items] |  |
Revenues | 28.1 | 22.0
Education | Building & Energy Solutions |  |
Revenue from External Customer [Line Items] |  |
Revenues | 0.0 | 0.0
Aviation |  |
Revenue from External Customer [Line Items] |  |
Revenues | 270.1 | 249.5
Aviation | Facility Solutions |  |
Revenue from External Customer [Line Items] |  |
Revenues | 256.9 | 236.6
Aviation | Janitorial |  |
Revenue from External Customer [Line Items] |  |
Revenues | 53.3 | 36.5
Aviation | Aviation Services |  |
Revenue from External Customer [Line Items] |  |
Revenues | 117.3 | 117.4
Aviation | Parking and Transportation |  |
Revenue from External Customer [Line Items] |  |
Revenues | 86.3 | 82.7
Aviation | Engineering and Infrastructure Solutions |  |
Revenue from External Customer [Line Items] |  |
Revenues | 13.2 | 13.0
Aviation | Operations and Maintenance |  |
Revenue from External Customer [Line Items] |  |
Revenues | 13.2 | 13.0
Aviation | Building & Energy Solutions |  |
Revenue from External Customer [Line Items] |  |
Revenues | 0.0 | 0.0
Technical Solutions |  |
Revenue from External Customer [Line Items] |  |
Revenues | 202.3 | 165.9
Technical Solutions | Facility Solutions |  |
Revenue from External Customer [Line Items] |  |
Revenues | 0.0 | 0.0
Technical Solutions | Janitorial |  |
Revenue from External Customer [Line Items] |  |
Revenues | 0.0 | 0.0
Technical Solutions | Aviation Services |  |
Revenue from External Customer [Line Items] |  |
Revenues | 0.0 | 0.0
Technical Solutions | Parking and Transportation |  |
Revenue from External Customer [Line Items] |  |
Revenues | 0.0 | 0.0
Technical Solutions | Engineering and Infrastructure Solutions |  |
Revenue from External Customer [Line Items] |  |
Revenues | 202.3 | 165.9
Technical Solutions | Operations and Maintenance |  |
Revenue from External Customer [Line Items] |  |
Revenues | 0.0 | 0.0
Technical Solutions | Building & Energy Solutions |  |
Revenue from External Customer [Line Items] |  |
Revenues | $ 202.3 | $ 165.9

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