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Significant Accounting Polices - Narrative (Details) - USD ($) $ in Thousands |  | 9 Months Ended
--- | --- | ---
Apr. 30, 2014 | Sep. 30, 2016 | Sep. 30, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Income tax expense and other income |  | $ 120,987 | $ 109,865
Consolidated loan rebate fee |  | 1.05% |
Additional Tax Positions |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Increase (Decrease) in tax receivable and income tax payable | $ 120,000 |  |
Income tax expense and other income | $ 9,000 |  |

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