| Segment Information | 
Segment Information The table below provides certain financial information for each of our business segments.  
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|   |   | Three Months Ended December 31, |  
| (dollars in thousands) |   | 2017 |   | % (1) |   | 2016 |   | % (1) |  
| Revenue: |   |   | 
 |   |   | 
 |   |   | 
 |   |   | 
 |  
| Health Services |   | $ | 352,090 | 
 |   | 100 | % |   | $ | 340,729 | 
 |   | 100 | % |  
| U.S. Federal Services |   | 132,983 | 
 |   | 100 | % |   | 141,298 | 
 |   | 100 | % |  
| Human Services |   | 138,075 | 
 |   | 100 | % |   | 125,537 | 
 |   | 100 | % |  
| Total |   | $ | 623,148 | 
 |   | 100 | % |   | $ | 607,564 | 
 |   | 100 | % |  
| Gross profit: |   |   | 
 |   |   | 
 |   |   | 
 |   |   | 
 |  
| Health Services |   | $ | 91,056 | 
 |   | 25.9 | % |   | $ | 78,234 | 
 |   | 23.0 | % |  
| U.S. Federal Services |   | 33,358 | 
 |   | 25.1 | % |   | 37,576 | 
 |   | 26.6 | % |  
| Human Services |   | 27,546 | 
 |   | 20.0 | % |   | 29,008 | 
 |   | 23.1 | % |  
| Total |   | $ | 151,960 | 
 |   | 24.4 | % |   | $ | 144,818 | 
 |   | 23.8 | % |  
| Selling, general and administrative expense: |   |   | 
 |   |   | 
 |   |   | 
 |   |   | 
 |  
| Health Services |   | $ | 33,416 | 
 |   | 9.5 | % |   | $ | 28,107 | 
 |   | 8.2 | % |  
| U.S. Federal Services |   | 16,648 | 
 |   | 12.5 | % |   | 19,695 | 
 |   | 13.9 | % |  
| Human Services |   | 19,495 | 
 |   | 14.1 | % |   | 17,239 | 
 |   | 13.7 | % |  
| Other (2)  |   | — | 
 |   | NM | 
 |   | 357 | 
 |   | NM | 
 |  
| Total |   | $ | 69,559 | 
 |   | 11.2 | % |   | $ | 65,398 | 
 |   | 10.8 | % |  
| Operating income: |   |   | 
 |   |   | 
 |   |   | 
 |   |   | 
 |  
| Health Services |   | $ | 57,640 | 
 |   | 16.4 | % |   | $ | 50,127 | 
 |   | 14.7 | % |  
| U.S. Federal Services |   | 16,710 | 
 |   | 12.6 | % |   | 17,881 | 
 |   | 12.7 | % |  
| Human Services |   | 8,051 | 
 |   | 5.8 | % |   | 11,769 | 
 |   | 9.4 | % |  
| Amortization of intangible assets |   | (2,718 | ) |   | NM | 
 |   | (3,402 | ) |   | NM | 
 |  
| Restructuring costs (3) |   | — | 
 |   | NM | 
 |   | (2,242 | ) |   | NM | 
 |  
| Other (2) |   | — | 
 |   | NM | 
 |   | (357 | ) |   | NM | 
 |  
| Total |   | $ | 79,683 | 
 |   | 12.8 | % |   | $ | 73,776 | 
 |   | 12.1 | % | (1)    Percentage of respective segment revenue. Percentages not considered meaningful are marked “NM.” 
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(2) 
 | 
Other costs and credits relate to SG&A balances that do not relate directly to segment business activities. During the three months ended December 31, 2016 we incurred $0.4 million of legal costs pertaining to a matter which occurred in fiscal year 2009. This matter was settled in the third quarter of fiscal year 2017.
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| (3) | During fiscal year 2017, we incurred costs in restructuring our United Kingdom Human Services business. See "Note 5. Supplemental disclosures" for more information. |  |