Quarterly report pursuant to Section 13 or 15(d)

Debt - Derivatives (Details)

v3.7.0.1
Debt - Derivatives (Details) - Designated as Hedging Instrument - Interest Rate Swaps - USD ($)
$ in Thousands
Jun. 30, 2017
Sep. 30, 2016
Derivatives, Fair Value [Line Items]    
Total derivatives $ 3,552 $ (5,834)
Current assets: Other Current Assets    
Derivatives, Fair Value [Line Items]    
Assets derivatives 948 43
Long-term assets: Other Assets    
Derivatives, Fair Value [Line Items]    
Assets derivatives 2,693 150
Current Liabilities: Other Current Liabilities    
Derivatives, Fair Value [Line Items]    
Liability derivatives (25) (1,529)
Long-Term Liabilities: Other Liabilities    
Derivatives, Fair Value [Line Items]    
Liability derivatives $ (64) $ (4,498)