Quarterly report pursuant to Section 13 or 15(d)

Segment Information - Financial information by segment (Details)

v3.21.1
Segment Information - Financial information by segment (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2021
USD ($)
segment
state
Mar. 31, 2020
USD ($)
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 $ 959,280 $ 818,135 $ 1,904,834 $ 1,636,364
Gross profit:        
Gross profit $ 230,658 $ 153,098 $ 436,713 $ 328,548
Gross profit (as a percent) 24.00% 18.70% 22.90% 20.10%
Selling, general & administrative expense:        
Selling, general, and administrative expenses $ 112,402 $ 106,853 $ 224,369 $ 194,080
Selling, general, and administrative expense (as a percent) 11.70% 13.10% 11.80% 11.90%
Operating income:        
Operating income $ 113,186 $ 37,311 $ 200,758 $ 116,446
Operating income (as a percent) 11.80% 4.60% 10.50% 7.10%
Amortization of intangible assets $ (5,070) $ (8,934) $ (11,586) $ (18,022)
Segment Reconciling Items        
Selling, general & administrative expense:        
Selling, general, and administrative expenses 2,818 3,484 5,045 4,021
Operating income:        
Amortization of intangible assets (5,070) (8,934) (11,586) (18,022)
Other (2,818) (3,484) (5,045) (4,021)
Acquisition-related expenses 2,500   4,300  
U.S. Services        
Revenue:        
Revenue 448,215 308,698 833,149 620,979
U.S. Services | Operating Segments        
Revenue:        
Revenue 448,215 308,698 833,149 620,979
Gross profit:        
Gross profit $ 119,440 $ 85,454 $ 218,442 $ 175,044
Gross profit (as a percent) 26.60% 27.70% 26.20% 28.20%
Selling, general & administrative expense:        
Selling, general, and administrative expenses $ 36,593 $ 39,239 $ 74,049 $ 70,637
Selling, general, and administrative expense (as a percent) 8.20% 12.70% 8.90% 11.40%
Operating income:        
Operating income $ 82,847 $ 46,215 $ 144,393 $ 104,407
Operating income (as a percent) 18.50% 15.00% 17.30% 16.80%
U.S. Federal Services        
Revenue:        
Revenue $ 330,136 $ 393,391 $ 735,381 $ 759,962
U.S. Federal Services | Operating Segments        
Revenue:        
Revenue 330,136 393,391 735,381 759,962
Gross profit:        
Gross profit $ 74,133 $ 76,958 $ 156,629 $ 147,779
Gross profit (as a percent) 22.50% 19.60% 21.30% 19.40%
Selling, general & administrative expense:        
Selling, general, and administrative expenses $ 50,978 $ 46,726 $ 103,230 $ 85,965
Selling, general, and administrative expense (as a percent) 15.40% 11.90% 14.00% 11.30%
Operating income:        
Operating income $ 23,155 $ 30,232 $ 53,399 $ 61,814
Operating income (as a percent) 7.00% 7.70% 7.30% 8.10%
Outside the U.S.        
Revenue:        
Revenue $ 180,929 $ 116,046 $ 336,304 $ 255,423
Outside the U.S. | Operating Segments        
Revenue:        
Revenue 180,929 116,046 336,304 255,423
Gross profit:        
Gross profit $ 37,085 $ (9,314) $ 61,642 $ 5,725
Gross profit (as a percent) 20.50% (8.00%) 18.30% 2.20%
Selling, general & administrative expense:        
Selling, general, and administrative expenses $ 22,013 $ 17,404 $ 42,045 $ 33,457
Selling, general, and administrative expense (as a percent) 12.20% 15.00% 12.50% 13.10%
Operating income:        
Operating income $ 15,072 $ (26,718) $ 19,597 $ (27,732)
Operating income (as a percent) 8.30% (23.00%) 5.80% (10.90%)