Quarterly report pursuant to Section 13 or 15(d)

Business Segments - Financial information by segment (Details)

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Business Segments - Financial information by segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Revenue:        
Revenue $ 1,314,929 $ 1,188,677 $ 3,990,327 $ 3,644,775
Gross profit:        
Gross profit $ 332,314 $ 264,364 $ 949,957 $ 737,714
Gross profit (as a percent) 25.30% 22.20% 23.80% 20.20%
Selling, general, and administrative expenses:        
Selling, general, and administrative expenses $ 167,033 $ 182,545 $ 504,682 $ 471,445
Selling, general, and administrative expenses (as a percent) 12.70% 15.40% 12.60% 12.90%
Divestiture-related charges     $ 1,018 $ 883
Operating income/(loss):        
Operating income $ 141,739 $ 58,388 $ 376,743 $ 195,670
Operating income (as a percent) 10.80% 4.90% 9.40% 5.40%
Amortization of Intangible Assets $ (23,542) $ (23,431) $ (68,532) $ (70,599)
Operating Segments | U.S. Federal Services        
Revenue:        
Revenue 683,347 583,960 2,062,127 1,786,202
Gross profit:        
Gross profit $ 186,075 $ 156,945 $ 506,074 $ 402,513
Gross profit (as a percent) 27.20% 26.90% 24.50% 22.50%
Selling, general, and administrative expenses:        
Selling, general, and administrative expenses $ 79,949 $ 82,892 $ 247,671 $ 229,591
Selling, general, and administrative expenses (as a percent) 11.70% 14.20% 12.00% 12.90%
Operating income/(loss):        
Operating income $ 106,126 $ 74,053 $ 258,403 $ 172,922
Operating income (as a percent) 15.50% 12.70% 12.50% 9.70%
Operating Segments | U.S. Services        
Revenue:        
Revenue $ 472,298 $ 449,061 $ 1,448,258 $ 1,338,242
Gross profit:        
Gross profit $ 121,012 $ 98,538 $ 369,497 $ 268,152
Gross profit (as a percent) 25.60% 21.90% 25.50% 20.00%
Selling, general, and administrative expenses:        
Selling, general, and administrative expenses $ 59,531 $ 51,536 $ 174,032 $ 140,793
Selling, general, and administrative expenses (as a percent) 12.60% 11.50% 12.00% 10.50%
Operating income/(loss):        
Operating income $ 61,481 $ 47,002 $ 195,465 $ 127,359
Operating income (as a percent) 13.00% 10.50% 13.50% 9.50%
Operating Segments | Outside the U.S.        
Revenue:        
Revenue $ 159,284 $ 155,656 $ 479,942 $ 520,331
Gross profit:        
Gross profit $ 25,227 $ 8,881 $ 74,386 $ 67,049
Gross profit (as a percent) 15.80% 5.70% 15.50% 12.90%
Selling, general, and administrative expenses:        
Selling, general, and administrative expenses $ 26,647 $ 24,122 $ 75,249 $ 75,936
Selling, general, and administrative expenses (as a percent) 16.70% 15.50% 15.70% 14.60%
Operating income/(loss):        
Operating income $ (1,420) $ (15,241) $ (863) $ (8,887)
Operating income (as a percent) (0.90%) (9.80%) (0.20%) (1.70%)
Segment Reconciling Items        
Selling, general, and administrative expenses:        
Selling, general, and administrative expenses $ 906 $ 23,995 $ 6,712 $ 24,242
Divestiture-related charges 0 0 1,018 883
Operating income/(loss):        
Operating income (906) (23,995) (6,712) (24,242)
Amortization of Intangible Assets (23,542) (23,431) (68,532) (70,599)
Other expense $ 300 $ 22,100 $ 3,300 $ 22,100