Commitments and Contingencies - Narrative (Details) $ in Thousands		12 Months Ended
	Mar. 29, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2021 press
Loss Contingencies [Line Items]
Insurance proceeds received for damaged property		$ 4,101	$ 7,828
Gain on insurance proceeds received		2,397	5,874
Recoverable amounts of business interruption expenses		546
Quality Aluminum Forge, LLC Manufacturing Facility Fire
Loss Contingencies [Line Items]
Insurance proceeds received for damaged property		4,548
Gain on insurance proceeds received		2,397	5,874
Recoverable amounts of business interruption expenses		546	1,219
Quality Aluminum Forge, LLC Manufacturing Facility Fire | Income before income tax benefit
Loss Contingencies [Line Items]
Gain on insurance proceeds received		$ 3,001	$ 8,974
Quality Aluminum Forge, LLC Manufacturing Facility Fire | Damage from Fire, Explosion or Other Hazard
Loss Contingencies [Line Items]
Number of additional presses to be restored | press				2
Number of presses damaged | press				6
Class Action Suit in Superior Court of California, Orange County - Wage-and-hour law violations
Loss Contingencies [Line Items]
Loss contingency, paid	$ 315