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 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Revenue:        
Revenue $ 612,787 $ 622,047 $ 1,235,935 $ 1,229,611
Revenue (as a percent) 100.00% 100.00% 100.00% 100.00%
Gross profit:        
Gross profit $ 148,803 $ 152,317 $ 300,763 $ 297,135
Gross profit (as a percent) 24.30% 24.50% 24.30% 24.20%
Selling, general and administrative expense:        
Selling, general and administrative expenses $ 72,559 $ 68,596 $ 142,118 $ 133,994
Selling, general, and administrative expense (as a percent) 11.80% 11.00% 11.50% 10.90%
Operating income:        
Operating income $ 71,321 $ 80,335 $ 151,004 $ 154,111
Operating income (as a percent) 11.60% 12.90% 12.20% 12.50%
Amortization of intangible assets $ (2,603) $ (3,386) $ (5,321) $ (6,788)
Restructuring cost   0 (2,320) (2,242)
Segment Reconciling Items        
Operating income:        
Amortization of intangible assets (2,603) (3,386) (5,321) (6,788)
Restructuring cost (2,320) 0 (2,320) (2,242)
Other        
Selling, general and administrative expense:        
Selling, general and administrative expenses 0 92 0 449
Operating income:        
Operating income 0 (92) 0 (449)
Legal costs       400
Health Services | Operating Segments        
Revenue:        
Revenue $ 365,633 $ 348,994 $ 717,723 $ 689,723
Revenue (as a percent) 100.00% 100.00% 100.00% 100.00%
Gross profit:        
Gross profit $ 98,207 $ 86,454 $ 189,263 $ 164,688
Gross profit (as a percent) 26.90% 24.80% 26.40% 23.90%
Selling, general and administrative expense:        
Selling, general and administrative expenses $ 35,190 $ 29,914 $ 68,606 $ 58,021
Selling, general, and administrative expense (as a percent) 9.60% 8.60% 9.60% 8.40%
Operating income:        
Operating income $ 63,017 $ 56,540 $ 120,657 $ 106,667
Operating income (as a percent) 17.20% 16.20% 16.80% 15.50%
U.S. Federal Services | Operating Segments        
Revenue:        
Revenue $ 116,327 $ 145,370 $ 249,310 $ 286,668
Revenue (as a percent) 100.00% 100.00% 100.00% 100.00%
Gross profit:        
Gross profit $ 27,374 $ 36,571 $ 60,732 $ 74,147
Gross profit (as a percent) 23.50% 25.20% 24.40% 25.90%
Selling, general and administrative expense:        
Selling, general and administrative expenses $ 17,540 $ 18,927 $ 34,188 $ 38,622
Selling, general, and administrative expense (as a percent) 15.10% 13.00% 13.70% 13.50%
Operating income:        
Operating income $ 9,834 $ 17,644 $ 26,544 $ 35,525
Operating income (as a percent) 8.50% 12.10% 10.60% 12.40%
Human Services | Operating Segments        
Revenue:        
Revenue $ 130,827 $ 127,683 $ 268,902 $ 253,220
Revenue (as a percent) 100.00% 100.00% 100.00% 100.00%
Gross profit:        
Gross profit $ 23,222 $ 29,292 $ 50,768 $ 58,300
Gross profit (as a percent) 17.80% 22.90% 18.90% 23.00%
Selling, general and administrative expense:        
Selling, general and administrative expenses $ 19,829 $ 19,663 $ 39,324 $ 36,902
Selling, general, and administrative expense (as a percent) 15.20% 15.40% 14.60% 14.60%
Operating income:        
Operating income $ 3,393 $ 9,629 $ 11,444 $ 21,398
Operating income (as a percent) 2.60% 7.50% 4.30% 8.50%