Annual report pursuant to Section 13 and 15(d)

Business Segments - Financial information by segment (Details)

v3.22.2.2
Business Segments - Financial information by segment (Details)
$ in Thousands
 12 Months Ended
Sep. 30, 2022
USD ($)
segment
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Financial information for each of the Company's business segments      
Number of operating segments | segment 3    
Revenue:      
Revenue $ 4,631,018 $ 4,254,485 $ 3,461,537
Gross profit:      
Gross profit $ 939,810 $ 946,975 $ 711,002
Gross profit (as a percent) 20.30% 22.30% 20.50%
Selling, general, and administrative expenses:      
Selling, general, and administrative expenses $ 534,493 $ 494,088 $ 387,090
Selling, general, and administrative expense (as a percent) 11.50% 11.60% 11.20%
Gain on sale of a business $ 0 $ 0 $ (1,718)
Operating income:      
Operating income $ 325,898 $ 408,530 $ 288,278
Operating income (as a percent) 7.00% 9.60% 8.30%
Amortization of intangible assets $ (90,465) $ (44,357) $ (35,634)
Gain on sale of a business 0 0 (1,718)
Gain on sale of land and building 11,046 0 0
Depreciation and amortization:      
Depreciation and amortization $ 42,330 $ 46,361 $ 64,527
Depreciation and amortization (as a percent) 0.90% 1.10% 1.90%
Land and Building      
Operating income:      
Gain on sale of land and building $ 11,000    
Segment Reconciling Items      
Selling, general, and administrative expenses:      
Selling, general, and administrative expenses (3,454) $ 10,746 $ 4,358
Gain on sale of a business 0 0 (1,718)
Operating income:      
Amortization of intangible assets (90,465) (44,357) (35,634)
Gain on sale of a business 0 0 (1,718)
Gain on sale of land and building 11,046 0 0
Other 3,454 (10,746) (4,358)
U.S. Federal Services | Operating Segments      
Revenue:      
Revenue 2,259,744 1,893,284 1,633,337
Gross profit:      
Gross profit $ 519,440 $ 432,551 $ 318,925
Gross profit (as a percent) 23.00% 22.80% 19.50%
Selling, general, and administrative expenses:      
Selling, general, and administrative expenses $ 284,509 $ 243,485 $ 186,023
Selling, general, and administrative expense (as a percent) 12.60% 12.90% 11.40%
Operating income:      
Operating income $ 234,931 $ 189,066 $ 132,902
Operating income (as a percent) 10.40% 10.00% 8.10%
Depreciation and amortization:      
Depreciation and amortization $ 12,332 $ 12,986 $ 25,153
Depreciation and amortization (as a percent) 0.50% 0.70% 1.50%
U.S. Services | Operating Segments      
Revenue:      
Revenue $ 1,607,612 $ 1,662,110 $ 1,329,274
Gross profit:      
Gross profit $ 343,004 $ 408,050 $ 360,272
Gross profit (as a percent) 21.30% 24.60% 27.10%
Selling, general, and administrative expenses:      
Selling, general, and administrative expenses $ 160,902 $ 153,609 $ 132,489
Selling, general, and administrative expense (as a percent) 10.00% 9.20% 10.00%
Operating income:      
Operating income $ 182,102 $ 254,441 $ 227,783
Operating income (as a percent) 11.30% 15.30% 17.10%
Depreciation and amortization:      
Depreciation and amortization $ 16,528 $ 20,350 $ 20,951
Depreciation and amortization (as a percent) 1.00% 1.20% 1.60%
Outside the U.S. | Operating Segments      
Revenue:      
Revenue $ 763,662 $ 699,091 $ 498,926
Gross profit:      
Gross profit $ 77,366 $ 106,374 $ 31,805
Gross profit (as a percent) 10.10% 15.20% 6.40%
Selling, general, and administrative expenses:      
Selling, general, and administrative expenses $ 92,536 $ 86,248 $ 65,938
Selling, general, and administrative expense (as a percent) 12.10% 12.30% 13.20%
Operating income:      
Operating income $ (15,170) $ 20,126 $ (34,133)
Operating income (as a percent) (2.00%) 2.90% (6.80%)
Depreciation and amortization:      
Depreciation and amortization $ 13,470 $ 13,025 $ 18,423
Depreciation and amortization (as a percent) 1.80% 1.90% 3.70%