Summary of Significant Accounting Policies - Recasting of Certain Prior Period Information (Details) - USD ($) $ in Thousands	12 Months Ended
	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