Commitments and Contingencies - Narrative (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 26, 2018 building press
Loss Contingencies [Line Items]
Impairment charges offset by insurance proceeds		$ 1,107
Rent expense		2,391	$ 2,522
Class Action Suit in Superior Court of California, Orange County - Wage-and-hour law violations
Loss Contingencies [Line Items]
Estimated loss on class action lawsuit		250	$ 11
Loss contingency, paid	$ 391
Insurance recoveries
Loss Contingencies [Line Items]
Number of manufacturing buildings | building				3
Number of presses on site | press				8
Insurance proceeds recorded		11,986
Cash proceeds		8,486
Business interruption		1,168
Damage from Fire, Explosion or Other Hazard | Insurance recoveries
Loss Contingencies [Line Items]
Number of damaged manufacturing buildings | building				1
Number of damaged presses on site | press				6
Buildings | Insurance recoveries
Loss Contingencies [Line Items]
Capital expenditures (equipment)		$ 2,878