Quarterly report pursuant to Section 13 or 15(d)

Segment Information (Details)

v3.7.0.1
Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Revenue:        
Revenue $ 622,047 $ 606,453 $ 1,229,611 $ 1,163,175
Revenue (as a percent) 100.00% 100.00% 100.00% 100.00%
Gross profit:        
Gross profit $ 152,317 $ 147,667 $ 297,135 $ 257,882
Gross profit (as a percent) 24.50% 24.30% 24.20% 22.20%
Selling, general and administrative expense:        
Selling, general and administrative expenses $ 68,596 $ 65,976 $ 133,994 $ 130,210
Selling, general, and administrative expense (as a percent) 11.00% 10.90% 10.90% 11.20%
Operating income:        
Operating income (as a percent) 12.90% 12.80% 12.50% 10.40%
Operating income $ 80,335 $ 77,900 $ 154,111 $ 120,686
Amortization of intangible assets (3,386) (3,262) (6,788) (6,411)
Restructuring cost 0 0 (2,242) 0
Acquisition-related expenses 0 (529) 0 (575)
Segment Reconciling Items        
Operating income:        
Amortization of intangible assets (3,386) (3,262) (6,788) (6,411)
Restructuring cost 0 0 (2,242) 0
Acquisition-related expenses 0 (529) 0 (575)
Legal-related costs     400  
Other        
Selling, general and administrative expense:        
Selling, general and administrative expenses 92 0 449 650
Operating income:        
Operating income 92 0 449  
Legal-related costs       650
Health Services | Operating Segments        
Revenue:        
Revenue $ 348,994 $ 330,567 $ 689,723 $ 622,470
Revenue (as a percent) 100.00% 100.00% 100.00% 100.00%
Gross profit:        
Gross profit $ 86,454 $ 82,717 $ 164,688 $ 134,689
Gross profit (as a percent) 24.80% 25.00% 23.90% 21.60%
Selling, general and administrative expense:        
Selling, general and administrative expenses $ 29,914 $ 25,803 $ 58,021 $ 50,967
Selling, general, and administrative expense (as a percent) 8.60% 7.80% 8.40% 8.20%
Operating income:        
Operating income (as a percent) 16.20% 17.20% 15.50% 13.40%
Operating income $ 56,540 $ 56,914 $ 106,667 $ 83,722
U.S. Federal Services | Operating Segments        
Revenue:        
Revenue $ 145,370 $ 150,191 $ 286,668 $ 295,476
Revenue (as a percent) 100.00% 100.00% 100.00% 100.00%
Gross profit:        
Gross profit $ 36,571 $ 33,421 $ 74,147 $ 61,659
Gross profit (as a percent) 25.20% 22.30% 25.90% 20.90%
Selling, general and administrative expense:        
Selling, general and administrative expenses $ 18,927 $ 18,438 $ 38,622 $ 35,960
Selling, general, and administrative expense (as a percent) 13.00% 12.30% 13.50% 12.20%
Operating income:        
Operating income (as a percent) 12.10% 10.00% 12.40% 8.70%
Operating income $ 17,644 $ 14,983 $ 35,525 $ 25,699
Human Services | Operating Segments        
Revenue:        
Revenue $ 127,683 $ 125,695 $ 253,220 $ 245,229
Revenue (as a percent) 100.00% 100.00% 100.00% 100.00%
Gross profit:        
Gross profit $ 29,292 $ 31,529 $ 58,300 $ 61,534
Gross profit (as a percent) 22.90% 25.10% 23.00% 25.10%
Selling, general and administrative expense:        
Selling, general and administrative expenses $ 19,663 $ 21,735 $ 36,902 $ 42,633
Selling, general, and administrative expense (as a percent) 15.40% 17.30% 14.60% 17.40%
Operating income:        
Operating income (as a percent) 7.50% 7.80% 8.50% 7.70%
Operating income $ 9,629 $ 9,794 $ 21,398 $ 18,901