v3.26.1
SEGMENT INFORMATION (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jul. 31, 2026
Jul. 31, 2025
Jul. 31, 2026
Jul. 31, 2025
Segment Reporting [Line Items]        
Number Of Reportable Segments, Not Disclosed, Flag     reportable segments  
Segment Reporting, Revenue [Abstract]        
Revenues $ 2,317.1 $ 2,224.0 $ 6,850.6 $ 6,450.5
Operating profit        
Operating profit 91.5 83.4 253.0 243.3
Income from unconsolidated affiliates 1.2 1.3 3.6 3.4
Interest expense (29.5) (25.3) (81.6) (72.1)
Income before income taxes 63.2 59.4 175.0 174.6
B&I        
Segment Reporting, Revenue [Abstract]        
Revenues 1,012.2 1,038.7 3,093.2 3,077.2
M&D        
Segment Reporting, Revenue [Abstract]        
Revenues 481.0 408.9 1,367.1 1,201.2
Aviation        
Segment Reporting, Revenue [Abstract]        
Revenues 328.1 291.8 936.6 822.0
Education        
Segment Reporting, Revenue [Abstract]        
Revenues 235.8 235.1 696.7 688.2
Technical Solutions        
Segment Reporting, Revenue [Abstract]        
Revenues 259.9 249.5 757.0 662.0
Operating Segments        
Segment Reporting, Revenue [Abstract]        
Revenues 2,317.1 2,224.0 6,850.6 6,450.5
Operating profit        
Direct labor costs 1,325.6 1,260.0 3,905.0 3,640.2
Indirect costs 73.4 64.8 219.5 206.9
General and administrative 68.3 66.9 201.4 194.7
Selling 25.3 25.8 78.6 75.6
Other segment expense 646.2 636.1 1,942.4 1,834.5
Operating profit 178.3 170.4 503.7 498.6
Operating Segments | B&I        
Segment Reporting, Revenue [Abstract]        
Revenues 1,012.2 1,038.7 3,093.2 3,077.2
Operating profit        
Direct labor costs 559.7 581.1 1,715.6 1,705.8
Indirect costs 28.8 26.1 89.0 91.7
General and administrative 20.2 23.8 59.0 65.1
Selling 8.8 8.4 26.0 24.8
Other segment expense 319.8 325.5 972.2 953.5
Operating profit 75.0 73.8 231.3 236.2
Other significant segment items        
Materials and supplies 30.3 28.8 85.9 83.2
Salaries and wages (other than direct) 29.2 29.8 89.8 94.4
Consulting and professional services 2.6 2.7 8.6 7.7
Travel and entertainment (other than direct) 2.5 2.1 7.4 6.6
Legal 1.5 2.2 4.5 5.1
Operating Segments | M&D        
Segment Reporting, Revenue [Abstract]        
Revenues 481.0 408.9 1,367.1 1,201.2
Operating profit        
Direct labor costs 304.6 270.0 871.5 786.0
Indirect costs 8.5 7.4 23.9 22.5
General and administrative 15.1 10.6 41.3 34.1
Selling 4.2 3.4 12.6 9.5
Other segment expense 108.1 81.1 300.3 233.4
Operating profit 40.5 36.4 117.5 115.6
Other significant segment items        
Materials and supplies 10.9 7.9 56.5 42.2
Salaries and wages (other than direct) 23.2 15.4 29.8 23.2
Consulting and professional services 2.2 0.6 5.9 3.3
Travel and entertainment (other than direct) 0.9 0.9 2.5 2.4
Legal 0.5 0.2 1.3 1.4
Operating Segments | Aviation        
Segment Reporting, Revenue [Abstract]        
Revenues 328.1 291.8 936.6 822.0
Operating profit        
Direct labor costs 205.3 171.2 579.8 481.6
Indirect costs 3.1 2.8 9.5 8.8
General and administrative 11.2 10.2 33.7 31.2
Selling 0.4 0.4 1.3 1.0
Other segment expense 89.7 87.4 265.1 250.9
Operating profit 18.4 19.7 47.3 48.4
Other significant segment items        
Materials and supplies 3.7 3.8 20.4 16.4
Salaries and wages (other than direct) 6.7 6.1 11.5 11.3
Consulting and professional services 7.2 11.4 19.9 34.6
Travel and entertainment (other than direct) 0.5 0.5 1.6 1.5
Legal 0.6 0.6 1.8 2.0
Operating Segments | Education        
Segment Reporting, Revenue [Abstract]        
Revenues 235.8 235.1 696.7 688.2
Operating profit        
Direct labor costs 150.5 153.2 450.7 455.8
Indirect costs 6.5 4.5 18.7 15.9
General and administrative 1.7 2.4 6.2 7.6
Selling 0.4 0.4 1.1 1.1
Other segment expense 53.8 53.5 159.0 158.9
Operating profit 23.0 21.1 60.9 48.9
Other significant segment items        
Materials and supplies 4.7 3.1 35.3 34.4
Salaries and wages (other than direct) 12.4 12.4 13.9 11.7
Consulting and professional services 0.9 0.8 2.0 2.6
Travel and entertainment (other than direct) 0.4 0.4 1.0 1.1
Legal 0.2 0.4 0.6 0.8
Operating Segments | Technical Solutions        
Segment Reporting, Revenue [Abstract]        
Revenues 259.9 249.5 757.0 662.0
Operating profit        
Direct labor costs 105.5 84.5 287.3 210.9
Indirect costs 26.5 23.9 78.4 68.0
General and administrative 20.1 20.0 61.2 56.6
Selling 11.5 13.2 37.6 39.3
Other segment expense 74.8 88.6 245.6 237.7
Operating profit 21.5 19.4 46.7 49.4
Other significant segment items        
Materials and supplies 33.4 33.4 202.8 190.3
Salaries and wages (other than direct) 57.4 69.5 102.5 95.9
Consulting and professional services 2.7 2.8 7.5 6.8
Travel and entertainment (other than direct) 1.7 1.7 5.5 5.2
Legal 0.2 0.4 0.9 0.9
Corporate        
Operating profit        
Operating profit (85.4) (85.7) (246.3) (251.8)
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment        
Operating profit        
Income from unconsolidated affiliates (1.2) (1.3) (3.6) (3.4)
Adjustment for tax deductions for energy efficient government buildings, included in Technical Solutions $ (0.2) $ 0.0 $ (0.7) $ (0.1)