v3.26.1
SEGMENT INFORMATION (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Apr. 30, 2026
Apr. 30, 2025
Apr. 30, 2026
Apr. 30, 2025
Segment Reporting Information [Line Items]        
Number Of Reportable Segments, Not Disclosed, Flag     reportable segments  
Segment Reporting Information, Revenue for Reportable Segment [Abstract]        
Revenues $ 2,290.0 $ 2,111.7 $ 4,533.5 $ 4,226.6
Operating profit        
Operating profit 86.9 82.3 161.6 159.9
Income from unconsolidated affiliates 1.0 1.4 2.4 2.1
Interest expense (28.1) (23.9) (52.1) (46.8)
Income before income taxes 59.7 59.8 111.9 115.2
B&I        
Segment Reporting Information, Revenue for Reportable Segment [Abstract]        
Revenues 1,015.8 1,015.5 2,080.9 2,038.4
M&D        
Segment Reporting Information, Revenue for Reportable Segment [Abstract]        
Revenues 463.8 398.1 886.1 792.4
Aviation        
Segment Reporting Information, Revenue for Reportable Segment [Abstract]        
Revenues 310.8 260.1 608.5 530.2
Education        
Segment Reporting Information, Revenue for Reportable Segment [Abstract]        
Revenues 232.2 227.8 460.9 453.2
Technical Solutions        
Segment Reporting Information, Revenue for Reportable Segment [Abstract]        
Revenues 267.3 210.2 497.1 412.4
Operating Segments        
Segment Reporting Information, Revenue for Reportable Segment [Abstract]        
Revenues 2,290.0 2,111.7 4,533.5 4,226.6
Operating profit        
Direct labor costs 1,294.5 1,185.9 2,579.4 2,380.2
Indirect costs 75.9 71.4 146.2 142.1
General and administrative 67.6 66.4 133.1 127.7
Selling 27.4 25.6 53.3 49.8
Other segment expense 657.8 595.6 1,296.1 1,198.4
Operating profit 166.9 166.6 325.4 328.2
Operating Segments | B&I        
Segment Reporting Information, Revenue for Reportable Segment [Abstract]        
Revenues 1,015.8 1,015.5 2,080.9 2,038.4
Operating profit        
Direct labor costs 559.5 553.8 1,155.9 1,124.7
Indirect costs 31.0 34.1 60.2 65.6
General and administrative 19.1 23.1 38.8 41.3
Selling 9.1 9.0 17.3 16.3
Other segment expense 320.5 312.5 652.5 628.0
Operating profit 76.7 83.0 156.4 162.4
Other significant segment items        
Materials and supplies 31.1 35.5 56.7 53.4
Salaries and wages (other than direct) 27.4 25.4 59.5 65.6
Consulting and professional services 3.2 2.1 6.0 5.0
Travel and entertainment (other than direct) 3.1 2.6 5.0 4.5
Legal 1.9 2.5 3.0 2.9
Operating Segments | M&D        
Segment Reporting Information, Revenue for Reportable Segment [Abstract]        
Revenues 463.8 398.1 886.1 792.4
Operating profit        
Direct labor costs 290.8 260.1 566.9 516.1
Indirect costs 10.0 6.5 15.5 15.1
General and administrative 14.3 12.6 26.2 23.6
Selling 5.2 3.0 8.4 6.1
Other segment expense 102.9 76.1 192.2 152.3
Operating profit 40.6 39.9 77.0 79.3
Other significant segment items        
Materials and supplies 10.9 7.3 33.3 26.8
Salaries and wages (other than direct) 17.4 12.7 18.9 15.3
Consulting and professional services 2.7 1.6 3.8 2.7
Travel and entertainment (other than direct) 1.1 1.1 1.6 1.5
Legal 0.5 0.1 0.8 1.2
Operating Segments | Aviation        
Segment Reporting Information, Revenue for Reportable Segment [Abstract]        
Revenues 310.8 260.1 608.5 530.2
Operating profit        
Direct labor costs 190.9 149.3 374.5 310.4
Indirect costs 3.2 2.6 6.4 5.9
General and administrative 11.3 10.8 22.5 21.0
Selling 0.4 0.3 0.9 0.6
Other segment expense 88.6 80.6 175.4 163.5
Operating profit 16.3 16.5 28.9 28.7
Other significant segment items        
Materials and supplies 3.8 3.7 13.7 10.3
Salaries and wages (other than direct) 7.0 4.9 7.8 7.4
Consulting and professional services 7.3 11.6 12.7 23.2
Travel and entertainment (other than direct) 0.6 0.4 1.1 1.0
Legal 0.8 0.8 1.2 1.4
Operating Segments | Education        
Segment Reporting Information, Revenue for Reportable Segment [Abstract]        
Revenues 232.2 227.8 460.9 453.2
Operating profit        
Direct labor costs 152.9 150.8 300.2 302.6
Indirect costs 6.3 5.9 12.3 11.4
General and administrative 2.2 2.9 4.5 5.2
Selling 0.4 0.4 0.7 0.7
Other segment expense 54.1 54.2 105.3 105.5
Operating profit 16.4 13.8 38.0 27.8
Other significant segment items        
Materials and supplies 4.7 4.7 22.8 22.0
Salaries and wages (other than direct) 12.0 11.2 9.2 8.6
Consulting and professional services 0.8 0.9 1.2 1.8
Travel and entertainment (other than direct) 0.4 0.4 0.6 0.7
Legal 0.2 0.3 0.3 0.4
Operating Segments | Technical Solutions        
Segment Reporting Information, Revenue for Reportable Segment [Abstract]        
Revenues 267.3 210.2 497.1 412.4
Operating profit        
Direct labor costs 100.4 72.1 181.9 126.4
Indirect costs 25.4 22.3 51.9 44.1
General and administrative 20.8 17.0 41.1 36.6
Selling 12.3 13.0 26.1 26.1
Other segment expense 91.7 72.3 170.8 149.2
Operating profit 16.8 13.4 25.2 30.0
Other significant segment items        
Materials and supplies 33.4 29.8 145.4 120.8
Salaries and wages (other than direct) 79.2 59.4 69.1 62.4
Consulting and professional services 2.3 2.1 4.8 3.9
Travel and entertainment (other than direct) 2.0 1.7 3.7 3.5
Legal 0.2 0.3 0.6 0.5
Corporate        
Operating profit        
Operating profit (79.0) (82.9) (160.9) (166.1)
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment        
Operating profit        
Income from unconsolidated affiliates (1.0) (1.4) (2.4) (2.1)
Adjustment for tax deductions for energy efficient government buildings, included in Technical Solutions $ 0.0 $ (0.1) $ (0.6) $ (0.1)