| 
           Commitments and Contingencies (Details) (USD $) 
         | 
        3 Months Ended | 9 Months Ended | 1 Months Ended | 12 Months Ended | 9 Months Ended | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| 
           Jun. 30, 2013 
         | 
        
           Jun. 30, 2012 
         | 
        
           Jun. 30, 2013 
         | 
        
           Jun. 30, 2012 
         | 
        
           Sep. 30, 2012 
         | 
        
           Mar. 31, 2009
 
          Medicaid Agency 
         | 
        
           Sep. 30, 2012
 
          School MAX Customers
 
          More than 
         | 
        
           Jun. 30, 2012
 
          Flexible New Deal contract 
         | 
        
           Jun. 30, 2013
 
          PSI
 
          Loss contract 
         | 
        
           Apr. 30, 2012
 
          PSI
 
          Loss contract 
         | 
      |
| Commitments and Contingencies | ||||||||||
| Amount of claim | $ 2,300,000 | $ 10,000,000 | ||||||||
| Claim received for revenue foregone | 2,700,000 | |||||||||
| Cost recoveries, net of subcontractor expenses | 1,700,000 | |||||||||
| Deferred revenue recorded | 7,939,000 | 7,939,000 | 19,550,000 | 15,100,000 | ||||||
| Additional revenue recognized from significant contract | 334,323,000 | 266,353,000 | 946,940,000 | 749,408,000 | 16,000,000 | |||||
| Additional cost recognized for significant contract | 239,763,000 | 187,652,000 | 678,406,000 | 546,094,000 | 5,100,000 | |||||
| Operating profit | $ 44,387,000 | $ 33,299,000 | $ 129,140,000 | $ 87,602,000 | $ 10,900,000 | |||||
| X | ||||||||||
| 
             
- Definition 
          Represents the amount of payment received for revenue earned. No definition available. 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Represents the amount of claim received of cost recoveries, net of subcontractor expenses. No definition available. 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          The aggregate cost of goods produced and sold and services rendered during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  | 
        
| X | ||||||||||
| 
             
- Details 
          
  | 
        
| X | ||||||||||
| 
             
- Definition 
          The value (monetary amount) of the award the plaintiff seeks in the legal matter. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          The net result for the period of deducting operating expenses from operating revenues. No definition available. 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  |