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)
$ in Thousands
 3 Months Ended 6 Months Ended
Feb. 14, 2024
segment
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2024
USD ($)
segment
Mar. 31, 2023
USD ($)
Financial information for each of the Company's business segments          
Number of operating segments | segment 3     3  
Revenue:          
Revenue   $ 1,348,357 $ 1,206,852 $ 2,675,398 $ 2,456,098
Gross profit:          
Gross profit   $ 317,589 $ 228,603 $ 617,643 $ 473,350
Gross profit (as a percent)   23.60% 18.90% 23.10% 19.30%
Selling, general, and administrative expenses:          
Selling, general, and administrative expenses   $ 168,454 $ 142,448 $ 337,649 $ 288,900
Selling, general, and administrative expenses (as a percent)   12.50% 11.80% 12.60% 11.80%
Divestiture-related charges       $ 1,018 $ 883
Operating income/(loss):          
Operating income   $ 127,494 $ 62,505 $ 235,004 $ 137,282
Operating income (as a percent)   9.50% 5.20% 8.80% 5.60%
Amortization of Intangible Assets   $ (21,641) $ (23,650) $ (44,990) $ (47,168)
Operating Segments | U.S. Federal Services          
Revenue:          
Revenue   701,702 584,075 1,378,780 1,202,242
Gross profit:          
Gross profit   $ 163,337 $ 122,874 $ 319,999 $ 245,568
Gross profit (as a percent)   23.30% 21.00% 23.20% 20.40%
Selling, general, and administrative expenses:          
Selling, general, and administrative expenses   $ 79,867 $ 75,050 $ 167,722 $ 146,699
Selling, general, and administrative expenses (as a percent)   11.40% 12.80% 12.20% 12.20%
Operating income/(loss):          
Operating income   $ 83,470 $ 47,824 $ 152,277 $ 98,869
Operating income (as a percent)   11.90% 8.20% 11.00% 8.20%
Operating Segments | U.S. Services          
Revenue:          
Revenue   $ 486,115 $ 449,703 $ 975,960 $ 889,181
Gross profit:          
Gross profit   $ 130,122 $ 86,016 $ 248,485 $ 169,614
Gross profit (as a percent)   26.80% 19.10% 25.50% 19.10%
Selling, general, and administrative expenses:          
Selling, general, and administrative expenses   $ 62,201 $ 43,415 $ 114,501 $ 89,257
Selling, general, and administrative expenses (as a percent)   12.80% 9.70% 11.70% 10.00%
Operating income/(loss):          
Operating income   $ 67,921 $ 42,601 $ 133,984 $ 80,357
Operating income (as a percent)   14.00% 9.50% 13.70% 9.00%
Operating Segments | Outside the U.S.          
Revenue:          
Revenue   $ 160,540 $ 173,074 $ 320,658 $ 364,675
Gross profit:          
Gross profit   $ 24,130 $ 19,713 $ 49,159 $ 58,168
Gross profit (as a percent)   15.00% 11.40% 15.30% 16.00%
Selling, general, and administrative expenses:          
Selling, general, and administrative expenses   $ 23,460 $ 23,425 $ 48,601 $ 51,814
Selling, general, and administrative expenses (as a percent)   14.60% 13.50% 15.20% 14.20%
Operating income/(loss):          
Operating income   $ 670 $ (3,712) $ 558 $ 6,354
Operating income (as a percent)   0.40% (2.10%) 0.20% 1.70%
Segment Reconciling Items          
Selling, general, and administrative expenses:          
Selling, general, and administrative expenses   $ 2,926 $ (325) $ 5,807 $ 247
Divestiture-related charges   0 883 1,018 883
Operating income/(loss):          
Amortization of Intangible Assets   (21,641) (23,650) (44,990) (47,168)
Other   $ (2,926) $ 325 $ (5,807) $ (247)