| 
           Commitments and Contingencies (Details) (USD $) 
         | 
        1 Months Ended | 3 Months Ended | 1 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 
           Mar. 31, 2009
 
          Medicaid Agency 
         | 
        
           Mar. 31, 2009
 
          Medicaid Agency 
         | 
        
           Sep. 30, 2008
 
          School MAX Customers 
         | 
        
           Apr. 30, 2012
 
          School MAX Customers
 
          More than 
         | 
        
           Mar. 31, 2012
 
          Credit Facilities and Performance Bonds 
         | 
        
           Sep. 30, 2011
 
          Credit Facilities and Performance Bonds 
         | 
        
           Mar. 31, 2012
 
          Credit Facilities and Performance Bonds
 
          Credit Facility
 
          Letters of credit 
         | 
        
           Sep. 30, 2011
 
          Flexible New Deal contract 
         | 
        
           Mar. 31, 2012
 
          Flexible New Deal contract
 
          Letters of credit 
         | 
        
           Mar. 31, 2012
 
          Loss contract 
         | 
        
           Mar. 31, 2011
 
          Loss contract 
         | 
        
           Mar. 31, 2012
 
          Loss contract 
         | 
        
           Mar. 31, 2011
 
          Loss contract 
         | 
      |
| Commitments and Contingencies | |||||||||||||
| Amount of claim | $ 2,300,000 | $ 10,000,000 | |||||||||||
| Loss in period | 700,000 | ||||||||||||
| Final audit report disputed amount | 42,000 | ||||||||||||
| Outstanding amount | 14,000,000 | ||||||||||||
| Outstanding amount of performance bond commitments | 17,100,000 | 16,900,000 | |||||||||||
| Reserve recorded to cover the liabilities | 500,000 | ||||||||||||
| Claim received for revenue foregone | 2,700,000 | ||||||||||||
| Cost recoveries, net of subcontractor expenses | 1,500,000 | ||||||||||||
| Charge on a fixed price contract | (2,600,000) | 4,200,000 | (2,600,000) | 7,300,000 | |||||||||
| Amount of recorded liability related to anticipated losses | $ 1,500,000 | $ 1,500,000 | |||||||||||