Property, Plant, and Equipment, net - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Jun. 30, 2023	Sep. 30, 2022	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2022
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 2,400		$ 1,200	$ 5,400	$ 3,200
Gain on sale of assets	0		$ 1,318	1,147	$ 1,919
Asset impairment charges		$ 3,000
Broadband
Property, Plant and Equipment [Line Items]
Restructuring, accelerated depreciation	800			$ 800
United States | Long-lived Assets | Geographic Concentration Risk
Property, Plant and Equipment [Line Items]
Concentration risk, percentage				95.40%		95.40%
Disposal Group, Held-for-sale, Not Discontinued Operations | Tinley Park Facility
Property, Plant and Equipment [Line Items]
Property, plant, and equipment held for sale	$ 10,300			$ 10,300
Gain on sale of assets				$ 1,200