Acquisition (Details) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
	Jun. 07, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Business Acquisition [Line Items]
Net revenue from acquisition date			$ 2,000		$ 2,000
Net income (loss) from acquisition date			$ (5,000)		$ (5,000)
Systron Donner Inertial, Inc.
Business Acquisition [Line Items]
Total purchase price	$ 25,000
Payments to acquire business	$ 22,000
Net revenue from acquisition date		$ 7,700		$ 22,100
Net income (loss) from acquisition date		$ 1,100		$ (300)
Common Stock | Systron Donner Inertial, Inc.
Business Acquisition [Line Items]
Common stock issues (shares)	811,000
Common stock issued	$ 3,000