Quarterly report pursuant to Section 13 or 15(d)

Segment Information (Details)

v3.8.0.1
Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Revenue:    
Revenue $ 623,148 $ 607,564
Revenue (as a percent) 100.00% 100.00%
Gross profit:    
Gross profit $ 151,960 $ 144,818
Gross profit (as a percent) 24.40% 23.80%
Selling, general and administrative expense:    
Selling, general and administrative expenses $ 69,559 $ 65,398
Selling, general, and administrative expense (as a percent) 11.20% 10.80%
Operating income:    
Operating income $ 79,683 $ 73,776
Operating income (as a percent) 12.80% 12.10%
Amortization of intangible assets $ (2,718) $ (3,402)
Restructuring cost 0 (2,242)
Segment Reconciling Items    
Operating income:    
Amortization of intangible assets (2,718) (3,402)
Restructuring cost 0 (2,242)
Other    
Selling, general and administrative expense:    
Selling, general and administrative expenses 0 357
Operating income:    
Operating income 0 (357)
Legal costs   400
Health Services | Operating Segments    
Revenue:    
Revenue $ 352,090 $ 340,729
Revenue (as a percent) 100.00% 100.00%
Gross profit:    
Gross profit $ 91,056 $ 78,234
Gross profit (as a percent) 25.90% 23.00%
Selling, general and administrative expense:    
Selling, general and administrative expenses $ 33,416 $ 28,107
Selling, general, and administrative expense (as a percent) 9.50% 8.20%
Operating income:    
Operating income $ 57,640 $ 50,127
Operating income (as a percent) 16.40% 14.70%
U.S. Federal Services | Operating Segments    
Revenue:    
Revenue $ 132,983 $ 141,298
Revenue (as a percent) 100.00% 100.00%
Gross profit:    
Gross profit $ 33,358 $ 37,576
Gross profit (as a percent) 25.10% 26.60%
Selling, general and administrative expense:    
Selling, general and administrative expenses $ 16,648 $ 19,695
Selling, general, and administrative expense (as a percent) 12.50% 13.90%
Operating income:    
Operating income $ 16,710 $ 17,881
Operating income (as a percent) 12.60% 12.70%
Human Services | Operating Segments    
Revenue:    
Revenue $ 138,075 $ 125,537
Revenue (as a percent) 100.00% 100.00%
Gross profit:    
Gross profit $ 27,546 $ 29,008
Gross profit (as a percent) 20.00% 23.10%
Selling, general and administrative expense:    
Selling, general and administrative expenses $ 19,495 $ 17,239
Selling, general, and administrative expense (as a percent) 14.10% 13.70%
Operating income:    
Operating income $ 8,051 $ 11,769
Operating income (as a percent) 5.80% 9.40%