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Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Parenthetical) $ in Thousands	12 Months Ended
	Jul. 29, 2017 USD ($)
Statement of Stockholders' Equity [Abstract]
Issuance of common stock upon early exercise of stock options	$ 642

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- Definition

Stock Issued During Period, Value, Stock Options Exercised Early

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_StatementOfStockholdersEquityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration