Quarterly report pursuant to Section 13 or 15(d)

Segment Information - Financial information by segment (Details)

v3.20.4
Segment Information - Financial information by segment (Details)
$ in Thousands
 3 Months Ended
Dec. 31, 2020
USD ($)
segment
state
Dec. 31, 2019
USD ($)
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 $ 945,554 $ 818,229
Gross profit:    
Gross profit $ 206,055 $ 175,450
Gross profit (as a percent) 21.80% 21.40%
Selling, general & administrative expense:    
Selling, general, and administrative expenses $ 111,967 $ 87,227
Selling, general, and administrative expense (as a percent) 11.80% 10.70%
Operating income:    
Operating income $ 87,572 $ 79,135
Operating income (as a percent) 9.30% 9.70%
Amortization of intangible assets $ (6,516) $ (9,088)
Segment Reconciling Items    
Selling, general & administrative expense:    
Selling, general, and administrative expenses 2,227 537
Operating income:    
Amortization of intangible assets (6,516) (9,088)
Acquisition-related expenses (1,873) 0
Other operating income (loss) (354) (537)
U.S. Services    
Revenue:    
Revenue 384,934 312,281
U.S. Services | Operating Segments    
Revenue:    
Revenue 384,934 312,281
Gross profit:    
Gross profit $ 99,002 $ 89,590
Gross profit (as a percent) 25.70% 28.70%
Selling, general & administrative expense:    
Selling, general, and administrative expenses $ 37,456 $ 31,398
Selling, general, and administrative expense (as a percent) 9.70% 10.10%
Operating income:    
Operating income $ 61,546 $ 58,192
Operating income (as a percent) 16.00% 18.60%
U.S. Federal Services    
Revenue:    
Revenue $ 405,245 $ 366,571
U.S. Federal Services | Operating Segments    
Revenue:    
Revenue 405,245 366,571
Gross profit:    
Gross profit $ 82,496 $ 70,821
Gross profit (as a percent) 20.40% 19.30%
Selling, general & administrative expense:    
Selling, general, and administrative expenses $ 52,252 $ 39,239
Selling, general, and administrative expense (as a percent) 12.90% 10.70%
Operating income:    
Operating income $ 30,244 $ 31,582
Operating income (as a percent) 7.50% 8.60%
Outside the U.S.    
Revenue:    
Revenue $ 155,375 $ 139,377
Outside the U.S. | Operating Segments    
Revenue:    
Revenue 155,375 139,377
Gross profit:    
Gross profit $ 24,557 $ 15,039
Gross profit (as a percent) 15.80% 10.80%
Selling, general & administrative expense:    
Selling, general, and administrative expenses $ 20,032 $ 16,053
Selling, general, and administrative expense (as a percent) 12.90% 11.50%
Operating income:    
Operating income $ 4,525 $ (1,014)
Operating income (as a percent) 2.90% (0.70%)