| Commitments and Contingencies (Details) In Millions | 1 Months Ended | 9 Months Ended | 9 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Mar. 31, 2009
 Medicaid Agency
 USD ($) | Feb. 28, 2011
 School MAX Customers | Aug. 31, 2010
 School MAX Customers
 USD ($) | Jun. 30, 2011
 Revolving credit agreement
 USD ($) | Jun. 30, 2011
 Swingline loans
 USD ($) | Jun. 30, 2011
 Letters of credit
 USD ($) | Jun. 30, 2011
 Letter of credit (Other than Revolving Credit Agreement)
 USD ($) | Jun. 30, 2011
 Atlantic Innovation Fund of Canada
 CAD | Jun. 30, 2011
 Performance Bonds
 USD ($) | Sep. 30, 2010
 Performance Bonds
 USD ($) | Jun. 30, 2011
 Loss contract
 USD ($) | |
| Commitments and Contingencies | |||||||||||
| Amount of claim | $ 2.3 | ||||||||||
| Loss in period | 7.3 | ||||||||||
| Amount of refunds recommended by audit report | 11.6 | ||||||||||
| Damages alleged by client | in excess of $30 million | ||||||||||
| Line of credit facility, maximum borrowing capacity | 35.0 | 5.0 | 25.0 | 1.8 | |||||||
| Maximum borrowing capacity after increase | 75.0 | ||||||||||
| Letters of credit, outstanding under the credit facility | 11.0 | 1.0 | |||||||||
| Line of credit facility, interest rate | (i) the prime lending rate as announced by SunTrust Bank (or, if higher, the federal funds effective rate plus 0.50% or the one-month adjusted LIBOR) (a "Base Rate Borrowing"), or (ii) the reserve adjusted rate per annum equal to the offered rate for deposits in U.S. dollars for a one (1), two (2), three (3) or six (6) month period in the London Inter-Bank Market (a "LIBOR Borrowing"), and, in each case, plus an applicable margin that is determined by reference to the Company's then-current leverage ratio | one (1) month LIBOR Borrowing, plus the applicable margin, or at a rate to be separately agreed upon by the Company and the administrative agent | |||||||||
| Loans outstanding | 1.8 | ||||||||||
| Performance bond commitments | 18.9 | 33.5 | |||||||||
| Liability under loss contracts | $ 4.2 | ||||||||||