Quarterly report pursuant to Section 13 or 15(d)

Business Segments - Financial information by segment (Details)

v3.22.0.1
Business Segments - Financial information by segment (Details)
$ in Thousands
 3 Months Ended
Dec. 31, 2021
USD ($)
segment
state
Dec. 31, 2020
USD ($)
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 $ 1,150,876 $ 945,554
Gross profit:    
Gross profit $ 228,155 $ 206,055
Gross profit (as a percent) 19.80% 21.80%
Selling, general, and administrative expenses:    
Selling, general, and administrative expenses $ 124,221 $ 111,967
Selling, general, and administrative expense (as a percent) 10.80% 11.80%
Operating income:    
Operating income $ 81,529 $ 87,572
Operating income (as a percent) 7.10% 9.30%
Amortization of intangible assets $ (22,405) $ (6,516)
Segment Reconciling Items    
Selling, general, and administrative expenses:    
Selling, general, and administrative expenses 2,854 2,227
Operating income:    
Amortization of intangible assets (22,405) (6,516)
Other (2,854) (2,227)
U.S. Services | Operating Segments    
Revenue:    
Revenue 386,417 384,934
Gross profit:    
Gross profit $ 89,699 $ 99,002
Gross profit (as a percent) 23.20% 25.70%
Selling, general, and administrative expenses:    
Selling, general, and administrative expenses $ 35,102 $ 37,456
Selling, general, and administrative expense (as a percent) 9.10% 9.70%
Operating income:    
Operating income $ 54,597 $ 61,546
Operating income (as a percent) 14.10% 16.00%
U.S. Federal Services | Operating Segments    
Revenue:    
Revenue $ 581,871 $ 405,245
Gross profit:    
Gross profit $ 126,576 $ 82,496
Gross profit (as a percent) 21.80% 20.40%
Selling, general, and administrative expenses:    
Selling, general, and administrative expenses $ 64,925 $ 52,252
Selling, general, and administrative expense (as a percent) 11.20% 12.90%
Operating income:    
Operating income $ 61,651 $ 30,244
Operating income (as a percent) 10.60% 7.50%
Outside the U.S. | Operating Segments    
Revenue:    
Revenue $ 182,588 $ 155,375
Gross profit:    
Gross profit $ 11,880 $ 24,557
Gross profit (as a percent) 6.50% 15.80%
Selling, general, and administrative expenses:    
Selling, general, and administrative expenses $ 21,340 $ 20,032
Selling, general, and administrative expense (as a percent) 11.70% 12.90%
Operating income:    
Operating income $ (9,460) $ 4,525
Operating income (as a percent) (5.20%) 2.90%