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Condensed Consolidated Statements of Cash Flow (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Apr. 30, 2022
May 01, 2021
Cash Flows from Operating Activities    
Net loss $ (110,779) $ (30,344)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Change in inventory reserves 2,301 6,422
Stock-based compensation expense 96,305 73,486
Depreciation, amortization, and accretion 27,185 21,933
Other 52 (1,863)
Change in operating assets and liabilities:    
Inventory (3,922) (96,981)
Prepaid expenses and other assets (11,386) (14,800)
Income tax receivables 1,069 (36,949)
Operating lease right-of-use assets and liabilities 4,492 (1,256)
Accounts payable 72,966 (3,482)
Accrued liabilities 15,058 40,914
Deferred revenue (916) 6,913
Gift card liability 1,190 2,018
Other liabilities 840 (1,073)
Net cash provided by (used in) operating activities 94,455 (35,062)
Cash Flows from Investing Activities    
Purchases of property and equipment (38,681) (23,690)
Purchases of securities available-for-sale (92,453) (148,999)
Sales of securities available-for-sale 5,812 73,863
Maturities of securities available-for-sale 98,308 132,999
Net cash provided by (used in) investing activities (27,014) 34,173
Cash Flows from Financing Activities    
Proceeds from the exercise of stock options, net 1,513 22,741
Payments for tax withholdings related to vesting of restricted stock units (27,915) (42,030)
Repurchase of common stock (30,042) 0
Net cash used in financing activities (56,444) (19,289)
Net increase (decrease) in cash and cash equivalents 10,997 (20,178)
Effect of exchange rate changes on cash (3,061) 1,460
Cash and cash equivalents at beginning of period 129,785 143,455
Cash and cash equivalents at end of period 137,721 124,737
Supplemental Disclosure    
Cash paid for income taxes 558 232
Supplemental Disclosure of Non-Cash Investing and Financing Activities:    
Purchases of property and equipment included in accounts payable and accrued liabilities 3,011 6,391
Capitalized stock-based compensation $ 5,662 $ 3,944