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Consolidated Statements of Cash Flow - USD ($)
$ in Thousands
 12 Months Ended
Aug. 03, 2019
Jul. 28, 2018
Jul. 29, 2017
Cash Flows from Operating Activities      
Net income $ 36,881 $ 44,900 $ (594)
Adjustments to reconcile net income to net cash provided by operating activities:      
Deferred income taxes (8,203) 6,588 (6,728)
Remeasurement of preferred stock warrant liability 0 (10,685) 18,881
Inventory reserves 7,974 1,916 3,591
Compensation expense related to certain stock sales by current and former employees 0 0 9,699
Stock-based compensation expense 35,256 15,403 3,545
Excess tax benefit related to stock-based compensation expense 0 0 (62)
Depreciation, amortization, and accretion 14,331 10,542 7,655
Loss on disposal of property and equipment 148 155 0
Change in operating assets and liabilities:      
Inventory (41,233) (19,416) (26,375)
Prepaid expenses and other assets (16,831) (17,307) (7,596)
Accounts payable 10,774 35,502 7,841
Accrued liabilities 22,856 (3,595) 17,748
Deferred revenue 3,325 1,720 2,719
Gift card liability 825 1,624 1,993
Other liabilities 12,491 4,831 6,307
Net cash provided by operating activities 78,594 72,178 38,624
Cash Flows from Investing Activities      
Purchases of property and equipment (30,825) (16,565) (17,130)
Purchases of securities available-for-sale (285,205) 0 0
Sales of securities available-for-sale 10,596 0 0
Maturities of securities available-for-sale 80,250 0 0
Net cash used in investing activities (225,184) (16,565) (17,130)
Cash Flows from Financing Activities      
Proceeds from initial public offering, net of underwriting discounts paid 0 129,046 0
Proceeds from the exercise of stock options, net 13,693 6,384 2,346
Payments for tax withholding related to vesting of restricted stock units (6,748) (596) 0
Excess tax benefit related to stock-based compensation expense 0 0 62
Repurchase of Class B common stock related to early exercised options 0 (39) (3,557)
Payment of deferred offering costs 0 0 (1,879)
Net cash provided by (used in) financing activities 6,945 134,795 (3,028)
Net increase (decrease) in cash, cash equivalents, and restricted cash (139,645) 190,408 18,466
Effect of exchange rate changes on cash 211 0 0
Cash, cash equivalents, and restricted cash at beginning of period 310,366 119,958 101,492
Cash, cash equivalents, and restricted cash at end of period 170,932 310,366 119,958
Components of Cash, Cash Equivalents, and Restricted Cash      
Total cash, cash equivalents, and restricted cash 170,932 310,366 101,492
Supplemental Disclosure      
Cash paid for income taxes 966 10,071 28,023
Supplemental Disclosure of Non-Cash Investing and Financing Activities:      
Purchases of property and equipment included in accounts payable and accrued liabilities 5,272 795 111
Capitalized stock-based compensation 1,789 883 164
Vesting of early exercised options 209 988 891
Conversion of preferred stock upon initial public offering 0 42,222 0
Reclassification of preferred stock warrant liability upon initial public offering 0 15,994 0
Deferred offering costs included in accrued liabilities 0 0 508
Deferred offering costs paid in prior year $ 0 $ 1,879 $ 0