Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity - 3 months ended Oct. 28, 2017 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Convertible Preferred Stock
Beginning balance, shares at Jul. 29, 2017	59,511,055				59,511,055
Beginning balance at Jul. 29, 2017	$ 42,222				$ 42,222
Ending balance, shares at Oct. 28, 2017	59,511,055				59,511,055
Ending balance at Oct. 28, 2017	$ 42,222				$ 42,222
Beginning balance at Jul. 29, 2017	61,861	$ 1	$ 27,002	$ 34,858
Beginning balance, shares at Jul. 29, 2017		26,834,535
Issuance of common stock upon exercise of stock options	444		444
Issuance of common stock upon exercise of stock options, shares		211,236
Repurchase of common stock related to early exercised options, shares		(19,479)
Vesting of early exercised options	315		315
Stock-based compensation	2,159		2,159
Net income	13,488			13,488
Ending balance at Oct. 28, 2017	$ 78,267	$ 1	$ 29,920	$ 48,346
Ending balance, shares at Oct. 28, 2017		27,026,292