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COMMITMENTS AND CONTINGENCIES - Future Minimum Payments Under Operating Agreement and Leases (Details) (USD $)
In Thousands, unless otherwise specified
Nov. 30, 2014
Operating Agreement  
2015 $ 2,220isca_OtherFutureMinimumPaymentsDueCurrent
2016 1,152isca_OtherFutureMinimumPaymentsDueInTwoYears
2017 1,055isca_OtherFutureMinimumPaymentsDueInThreeYears
2018 1,055isca_OtherFutureMinimumPaymentsDueInFourYears
2019 1,055isca_OtherFutureMinimumPaymentsDueInFiveYears
Thereafter 13,803isca_OtherFutureMinimumPaymentsDueThereafter
Total 20,340isca_OtherFutureMinimumPaymentsDue
Operating Leases  
2015 4,033us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
2016 2,974us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
2017 2,399us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
2018 2,005us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
2019 1,581us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
Thereafter 30,791us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
Total $ 43,783us-gaap_OperatingLeasesFutureMinimumPaymentsDue