Quarterly report [Sections 13 or 15(d)]

Business Segments - Financial Information by Segment (Details)

v3.25.2
Business Segments - Financial Information by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Revenue:        
Revenue $ 1,348,400 $ 1,314,929 $ 4,112,861 $ 3,990,327
Gross profit:        
Gross profit $ 359,513 $ 332,314 $ 999,891 $ 949,957
Gross profit (as a percent) 26.70% 25.30% 24.30% 23.80%
Selling, general, and administrative expenses:        
Selling, general, and administrative expenses $ 170,831 $ 167,033 $ 525,423 $ 504,682
Selling, general, and administrative expenses (as a percent) 12.70% 12.70% 12.80% 12.60%
Divestiture-related charges     $ 39,343 $ 1,018
Operating income:        
Operating income $ 165,672 $ 141,739 $ 405,427 $ 376,743
Operating income (as a percent) 12.30% 10.80% 9.90% 9.40%
Amortization of Intangible Assets $ (23,010) $ (23,542) $ (69,041) $ (68,532)
Divestiture-related charges     (39,343) (1,018)
Operating Segments | U.S. Federal Services        
Revenue:        
Revenue 761,174 683,347 2,319,756 2,062,127
Gross profit:        
Gross profit $ 226,134 $ 186,075 $ 601,507 $ 506,074
Gross profit (as a percent) 29.70% 27.20% 25.90% 24.50%
Selling, general, and administrative expenses:        
Selling, general, and administrative expenses $ 88,272 $ 79,949 $ 245,563 $ 247,671
Selling, general, and administrative expenses (as a percent) 11.60% 11.70% 10.60% 12.00%
Operating income:        
Operating income $ 137,862 $ 106,126 $ 355,944 $ 258,403
Operating income (as a percent) 18.10% 15.50% 15.30% 12.50%
Operating Segments | U.S. Services        
Revenue:        
Revenue $ 439,818 $ 472,298 $ 1,334,418 $ 1,448,258
Gross profit:        
Gross profit $ 105,932 $ 121,012 $ 312,706 $ 369,497
Gross profit (as a percent) 24.10% 25.60% 23.40% 25.50%
Selling, general, and administrative expenses:        
Selling, general, and administrative expenses $ 60,975 $ 59,531 $ 173,096 $ 174,032
Selling, general, and administrative expenses (as a percent) 13.90% 12.60% 13.00% 12.00%
Operating income:        
Operating income $ 44,957 $ 61,481 $ 139,610 $ 195,465
Operating income (as a percent) 10.20% 13.00% 10.50% 13.50%
Operating Segments | Outside the U.S.        
Revenue:        
Revenue $ 147,408 $ 159,284 $ 458,687 $ 479,942
Gross profit:        
Gross profit $ 27,447 $ 25,227 $ 85,678 $ 74,386
Gross profit (as a percent) 18.60% 15.80% 18.70% 15.50%
Selling, general, and administrative expenses:        
Selling, general, and administrative expenses $ 21,507 $ 26,647 $ 66,822 $ 75,249
Selling, general, and administrative expenses (as a percent) 14.60% 16.70% 14.60% 15.70%
Operating income:        
Operating income $ 5,940 $ (1,420) $ 18,856 $ (863)
Operating income (as a percent) 4.00% (0.90%) 4.10% (0.20%)
Segment Reconciling Items        
Selling, general, and administrative expenses:        
Selling, general, and administrative expenses $ 77 $ 906 $ 599 $ 6,712
Divestiture-related charges 0 0 39,343 1,018
Operating income:        
Amortization of Intangible Assets (23,010) (23,542) (69,041) (68,532)
Divestiture-related charges 0 0 (39,343) (1,018)
Other $ (77) $ (906) $ (599) $ (6,712)