Quarterly report pursuant to Section 13 or 15(d)

Segment Information - Financial information by segment (Details)

v3.20.1
Segment Information - Financial information by segment (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
segment
Mar. 31, 2019
USD ($)
Financial information for each of the Company's business segments        
Number of operating segments | segment     3  
Revenue:        
Revenue $ 818,135 $ 736,520 $ 1,636,364 $ 1,401,139
Gross profit:        
Gross profit $ 153,098 $ 169,422 $ 328,548 $ 328,687
Gross profit (as a percent) 18.70% 23.00% 20.10% 23.50%
Selling, general & administrative expense:        
Selling, general and administrative expenses $ 106,853 $ 78,102 $ 194,080 $ 157,773
Selling, general, and administrative expense (as a percent) 13.10% 10.60% 11.90% 11.30%
Operating income:        
Operating income $ 37,311 $ 81,801 $ 116,446 $ 155,937
Operating income (as a percent) 4.60% 11.10% 7.10% 11.10%
Amortization of intangible assets $ (8,934) $ (9,519) $ (18,022) $ (14,977)
Segment Reconciling Items        
Selling, general & administrative expense:        
Selling, general and administrative expenses 3,484 (394) 4,021 1,698
Operating income:        
Amortization of intangible assets (8,934) (9,519) (18,022) (14,977)
Other operating income (loss) (3,484) 394 (4,021) (1,698)
U.S. Health & Human Services        
Revenue:        
Revenue 308,698 290,737 620,979 584,950
U.S. Health & Human Services | Operating Segments        
Revenue:        
Revenue 308,698 290,737 620,979 584,950
Gross profit:        
Gross profit $ 85,454 $ 86,260 $ 175,044 $ 174,291
Gross profit (as a percent) 27.70% 29.70% 28.20% 29.80%
Selling, general & administrative expense:        
Selling, general and administrative expenses $ 39,239 $ 29,400 $ 70,637 $ 61,539
Selling, general, and administrative expense (as a percent) 12.70% 10.10% 11.40% 10.50%
Operating income:        
Operating income $ 46,215 $ 56,860 $ 104,407 $ 112,752
Operating income (as a percent) 15.00% 19.60% 16.80% 19.30%
U.S. Federal Services        
Revenue:        
Revenue $ 393,391 $ 289,736 $ 759,962 $ 506,723
U.S. Federal Services | Operating Segments        
Revenue:        
Revenue 393,391 289,736 759,962 506,723
Gross profit:        
Gross profit $ 76,958 $ 60,696 $ 147,779 $ 108,681
Gross profit (as a percent) 19.60% 20.90% 19.40% 21.40%
Selling, general & administrative expense:        
Selling, general and administrative expenses $ 46,726 $ 31,104 $ 85,965 $ 57,736
Selling, general, and administrative expense (as a percent) 11.90% 10.70% 11.30% 11.40%
Operating income:        
Operating income $ 30,232 $ 29,592 $ 61,814 $ 50,945
Operating income (as a percent) 7.70% 10.20% 8.10% 10.10%
Outside the U.S.        
Revenue:        
Revenue $ 116,046 $ 156,047 $ 255,423 $ 309,466
Outside the U.S. | Operating Segments        
Revenue:        
Revenue 116,046 156,047 255,423 309,466
Gross profit:        
Gross profit $ (9,314) $ 22,466 $ 5,725 $ 45,715
Gross profit (as a percent) (8.00%) 14.40% 2.20% 14.80%
Selling, general & administrative expense:        
Selling, general and administrative expenses $ 17,404 $ 17,992 $ 33,457 $ 36,800
Selling, general, and administrative expense (as a percent) 15.00% 11.50% 13.10% 11.90%
Operating income:        
Operating income $ (26,718) $ 4,474 $ (27,732) $ 8,915
Operating income (as a percent) (23.00%) 2.90% (10.90%) 2.90%