Long-Term Debt and Lines of Credit - Schedule of Interest Costs Expensed and Capitalized (Details) - USD ($) $ in Thousands  | 
12 Months Ended | ||
|---|---|---|---|
Sep. 30, 2018  | 
Sep. 30, 2017  | 
Sep. 30, 2016  | 
|
| Debt Disclosure [Abstract] | |||
| Interest expense | $ 8,561 | $ 9,141 | $ 9,893 | 
| Interest capitalized | 933 | 294 | 172 | 
| Total | $ 9,494 | $ 9,435 | $ 10,065 | 
| X | ||||||||||
- References No definition available. 
  | 
| X | ||||||||||
- Definition Amount of interest capitalized during the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
  | 
| X | ||||||||||
- Definition Total interest costs incurred during the period and either capitalized or charged against earnings. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
  | 
| X | ||||||||||
- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
  |