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Summary of Significant Accounting Policies - Recasting of Certain Prior Period Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Accounts payable and other accrued expenses and deferred gains and other long-term liabilities | $ (2,408) | $ 8,952 | $ 11,033
Income taxes receivable | 37,230 | 38,217 |
Reclassification Adjustment [Member] |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Accounts payable and other accrued expenses and deferred gains and other long-term liabilities |  | 200 | 10,300
Corporate [Member] |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Removal of historical corporate overhead allocations from segment level to corporate items | $ 18,200 | $ 17,800 | $ 18,200

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