Balance Sheet Components - Intangible Assets (Details) $ in Thousands		3 Months Ended	12 Months Ended
	Oct. 25, 2017 USD ($) Patent	Nov. 30, 2017 USD ($)	Aug. 31, 2017 USD ($)
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount		$ 1,062	$ 1,077
Accumulated Amortization		953	973
Total		$ 109	$ 104
Patents and trademarks
Finite Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Years)		15 years	15 years
Gross Carrying Amount		$ 556	$ 574
Accumulated Amortization		447	470
Total		$ 109	$ 104
Acquired technology
Finite Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Years)		5 years	5 years
Gross Carrying Amount		$ 506	$ 503
Accumulated Amortization		$ 506	$ 503
Patents
Finite Lived Intangible Assets [Line Items]
Number of patents sold | Patent	4
Proceeds from sale of intangible assets	$ 500