Accounting Changes (Details) - USD ($) $ in Thousands		Sep. 30, 2016	Sep. 30, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Debt issuance costs	[1]	$ 3,559	$ 2,194
Long-term Debt, Including Current Maturities | Accounting Standards Update 2015-03
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Debt issuance costs		$ 3,559	$ 2,194

[1] Prior-year amounts reflect the retrospective impact from the adoption of new accounting guidance regarding the classification of debt issuance costs (see Note 3).