| 
           Goodwill and Intangible Assets (Details) (USD $) 
        In Thousands, unless otherwise specified  | 
        6 Months Ended | 
|---|---|
| 
           Mar. 31, 2014 
         | 
      |
| Changes in goodwill | |
| Balance at the beginning of the period | $ 171,867 | 
| Changes to allocation of HML purchase price | 31 | 
| Foreign currency translation | 1,293 | 
| Balance at the end of the period | 173,191 | 
| 
           Health Services 
         | 
        |
| Changes in goodwill | |
| Balance at the beginning of the period | 125,096 | 
| Changes to allocation of HML purchase price | 31 | 
| Foreign currency translation | 1,393 | 
| Balance at the end of the period | 126,520 | 
| 
           Human Services 
         | 
        |
| Changes in goodwill | |
| Balance at the beginning of the period | 46,771 | 
| Foreign currency translation | (100) | 
| Balance at the end of the period | $ 46,671 |