Balance Sheet Components - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Feb. 28, 2022	Aug. 31, 2021
Property Plant And Equipment [Line Items]
Total property, plant and equipment	$ 51,475	$ 52,141
Less: Accumulated depreciation and amortization	(46,663)	(46,897)
Property, plant and equipment, net	4,812	5,244
Buildings and improvements
Property Plant And Equipment [Line Items]
Total property, plant and equipment	14,850	14,997
Machinery and equipment
Property Plant And Equipment [Line Items]
Total property, plant and equipment	33,918	34,421
Leasehold improvements
Property Plant And Equipment [Line Items]
Total property, plant and equipment	175	176
Other equipment
Property Plant And Equipment [Line Items]
Total property, plant and equipment	2,521	$ 2,547
Construction in progress
Property Plant And Equipment [Line Items]
Total property, plant and equipment	$ 11