Property, Plant and Equipment - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2016
Long Lived Assets Held-for-sale [Line Items]
Loss on write-downs of assets held for sale	$ 1,944
Disposal Group, Disposed of by Sale, Not Discontinued Operations
Long Lived Assets Held-for-sale [Line Items]
Total price		$ 2,800
Other Nonoperating Income (Expense)
Long Lived Assets Held-for-sale [Line Items]
Loss on write-downs of assets held for sale	1,900
Reported Value Measurement
Long Lived Assets Held-for-sale [Line Items]
Assets held-for-sale	4,800
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring
Long Lived Assets Held-for-sale [Line Items]
Assets held-for-sale	$ 2,900