|
Commitments and contingencies (Details) (USD $)
|
3 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Sep. 30, 2014
|
Jun. 30, 2014
|
Mar. 31, 2014
|
Dec. 31, 2013
|
Sep. 30, 2013
|
Jun. 30, 2013
|
Mar. 31, 2013
|
Dec. 31, 2012
|
Sep. 30, 2014
|
Sep. 30, 2013
|
Sep. 30, 2012
|
Sep. 30, 2013
PSI
Loss contract
|
Apr. 30, 2012
PSI
Loss contract
|
Mar. 31, 2009
Medicaid Agency
|
Sep. 30, 2012
School MAX Customers
Minimum
|
Sep. 30, 2014
Norton et al
|
Jan. 31, 2014
Norton et al
Minimum
|
|
| Commitments and Contingencies | |||||||||||||||||
| Percentage of employees covered by collective bargaining agreements | 14.00% | ||||||||||||||||
| Amount of claim | $ 2,300,000 | $ 10,000,000 | |||||||||||||||
| Reserve recorded to cover the liabilities | 600,000 | 5,000,000 | |||||||||||||||
| Deferred revenue recorded | 32,257,000 | 32,953,000 | 32,257,000 | 32,953,000 | 15,100,000 | ||||||||||||
| Additional revenue recognized from significant contract | 435,406,000 | 419,899,000 | 439,015,000 | 406,592,000 | 384,339,000 | 334,323,000 | 326,351,000 | 286,266,000 | 1,700,912,000 | 1,331,279,000 | 1,050,145,000 | 16,000,000 | |||||
| Additional cost recognized for significant contract | 1,248,789,000 | 945,246,000 | 762,202,000 | 5,100,000 | |||||||||||||
| Operating profit | $ 225,308,000 | $ 185,155,000 | $ 127,334,000 | $ 10,900,000 | |||||||||||||