Quarterly report pursuant to Section 13 or 15(d)

Segment Information - Financial information by segment (Details)

v3.21.2
Segment Information - Financial information by segment (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
segment
state
Jun. 30, 2020
USD ($)
Financial information for each of the Company's business segments        
Number of operating segments | segment     3  
Number of states supported in unemployment insurance programs (more than) | state     15  
Revenue:        
Revenue $ 1,243,520 $ 901,337 $ 3,148,354 $ 2,537,701
Gross profit:        
Gross profit $ 291,856 $ 185,603 $ 728,569 $ 514,151
Gross profit (as a percent) 23.50% 20.60% 23.10% 20.30%
Selling, general & administrative expense:        
Selling, general, and administrative expenses $ 140,129 $ 89,582 $ 364,498 $ 283,662
Selling, general, and administrative expense (as a percent) 11.30% 9.90% 11.60% 11.20%
Gain on sale of a business     $ 0 $ 1,706
Operating income:        
Operating income $ 139,595 $ 87,309 $ 340,353 $ 203,755
Operating income (as a percent)   9.70% 10.80% 8.00%
Amortization of intangible assets (12,132) $ (8,712) $ (23,718) $ (26,734)
Acquisition-related expenses     8,800  
Segment Reconciling Items        
Selling, general & administrative expense:        
Selling, general, and administrative expenses 4,903 134 9,948 4,155
Gain on sale of a business 0 1,706 0 1,706
Operating income:        
Amortization of intangible assets (12,132) (8,712) (23,718) (26,734)
Other (4,903) (134) (9,948) (4,155)
Acquisition-related expenses 5,600   8,800  
U.S. Services        
Revenue:        
Revenue 436,338 336,950 1,269,487 957,929
U.S. Services | Operating Segments        
Revenue:        
Revenue 436,338 336,950 1,269,487 957,929
Gross profit:        
Gross profit $ 104,814 $ 93,029 $ 323,256 $ 268,073
Gross profit (as a percent) 24.00% 27.60% 25.50% 28.00%
Selling, general & administrative expense:        
Selling, general, and administrative expenses $ 42,606 $ 31,996 $ 116,655 $ 102,633
Selling, general, and administrative expense (as a percent) 9.80% 9.50% 9.20% 10.70%
Operating income:        
Operating income $ 62,208 $ 61,033 $ 206,601 $ 165,440
Operating income (as a percent) 14.30% 18.10% 16.30% 17.30%
U.S. Federal Services        
Revenue:        
Revenue $ 617,601 $ 450,143 $ 1,352,982 $ 1,210,105
U.S. Federal Services | Operating Segments        
Revenue:        
Revenue 617,601 450,143 1,352,982 1,210,105
Gross profit:        
Gross profit $ 155,776 $ 84,723 $ 312,405 $ 232,502
Gross profit (as a percent) 25.20% 18.80% 23.10% 19.20%
Selling, general & administrative expense:        
Selling, general, and administrative expenses $ 69,647 $ 45,490 $ 172,877 $ 131,455
Selling, general, and administrative expense (as a percent) 11.30% 10.10% 12.80% 10.90%
Operating income:        
Operating income $ 86,129 $ 39,233 $ 139,528 $ 101,047
Operating income (as a percent) 13.90% 8.70% 10.30% 8.40%
Outside the U.S.        
Revenue:        
Revenue $ 189,581 $ 114,244 $ 525,885 $ 369,667
Outside the U.S. | Operating Segments        
Revenue:        
Revenue 189,581 114,244 525,885 369,667
Gross profit:        
Gross profit $ 31,266 $ 7,851 $ 92,908 $ 13,576
Gross profit (as a percent) 16.50% 6.90% 17.70% 3.70%
Selling, general & administrative expense:        
Selling, general, and administrative expenses $ 22,973 $ 13,668 $ 65,018 $ 47,125
Selling, general, and administrative expense (as a percent) 12.10% 12.00% 12.40% 12.70%
Operating income:        
Operating income $ 8,293 $ (5,817) $ 27,890 $ (33,549)
Operating income (as a percent) 4.40% (5.10%) 5.30% (9.10%)