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Condensed Consolidated Statements of Cash Flow (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
May 02, 2020
Apr. 27, 2019
Cash Flows from Operating Activities    
Net income (loss) $ (22,650) $ 29,702
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Deferred income taxes (12,307) (3,832)
Inventory reserves 18,383 2,805
Stock-based compensation expense 47,475 23,815
Depreciation, amortization, and accretion 16,264 10,191
Other 615 24
Change in operating assets and liabilities:    
Inventory (65,200) (27,818)
Prepaid expenses and other assets (4,481) (5,969)
Operating lease right-of-use assets and liabilities 1,728 0
Accounts payable (7,569) 20,083
Accrued liabilities 1,192 18,504
Deferred revenue 2,692 4,288
Gift card liability 1,661 1,251
Other liabilities 1,709 2,164
Net cash provided by (used in) operating activities (20,488) 75,208
Cash Flows from Investing Activities    
Purchases of property and equipment (18,651) (24,517)
Purchases of securities available-for-sale (191,894) (233,151)
Sales of securities available-for-sale 26,286 2,414
Maturities of securities available-for-sale 132,082 21,500
Net cash used in investing activities (52,177) (233,754)
Cash Flows from Financing Activities    
Proceeds from the exercise of stock options, net 6,236 9,284
Payments for tax withholding related to vesting of restricted stock units (7,884) (4,350)
Net cash provided by (used in) financing activities (1,648) 4,934
Net increase (decrease) in cash, cash equivalents, and restricted cash (74,313) (153,612)
Effect of exchange rate changes on cash 221 (75)
Cash, cash equivalents, and restricted cash at beginning of period 170,932 310,366
Cash, cash equivalents, and restricted cash at end of period 96,840 156,679
Components of Cash, Cash Equivalents, and Restricted Cash    
Total cash, cash equivalents, and restricted cash 96,840 156,679
Supplemental Disclosure    
Cash paid for income taxes 117 191
Supplemental Disclosure of Non-Cash Investing and Financing Activities:    
Purchases of property and equipment included in accounts payable and accrued liabilities 4,338 4,166
Capitalized stock-based compensation 1,701 1,277
Vesting of early exercised options 0 209
Leasehold improvements paid by landlord $ 7,406 $ 0