Commitments and Contingencies - Narrative (Details) $ in Thousands	6 Months Ended
	Mar. 31, 2020 USD ($) press_ton	Dec. 31, 2019 restored_building	Dec. 26, 2018 press
Loss Contingencies [Line Items]
Number of press tons | press_ton	2,500
Recoverable amounts of business interruption expenses	$ 915
Quality Aluminum Forge, LLC Manufacturing Facility Fire
Loss Contingencies [Line Items]
Number of recovered presses on site | restored_building		1
Cash proceeds	6,787
Proceeds directly to landlord	713
Recoverable amounts of business interruption expenses	$ 915
Damage from Fire, Explosion or Other Hazard | Quality Aluminum Forge, LLC Manufacturing Facility Fire
Loss Contingencies [Line Items]
Number of additional damaged presses on site | press			2
Number of presses to be restored | press			2
Number of presses damaged | press			6