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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Oct. 01, 2016
Cash flows from operating activities      
Net loss attributable to common stockholders—basic and diluted $ (15,604) $ (14,217) $ (38,214)
Adjustments to reconcile net loss to net cash provided by operating activities:      
Depreciation 39,358 35,014 34,323
Stock-based compensation expense 38,645 36,550 25,963
Other 1,676 713 4,098
Deferred income taxes 152 1,443 (857)
Foreign currency transaction (gain) loss 941 (3,568) 782
Changes in operating assets and liabilities:      
Accounts receivable, net (26,505) (2,727) (4,590)
Inventories, net (80,107) (60,270) 5,878
Other assets (2,140) 36 2,908
Accounts payable and accrued expenses 66,473 54,895 (5,715)
Accrued compensation 1,625 5,123 2,094
Deferred revenue 5,566 9,411 8,556
Other liabilities 490 1,557 8,068
Net cash provided by operating activities 30,570 63,960 43,294
Cash flows from investing activities      
Purchases of property and equipment (35,747) (33,553) (52,520)
Net cash used in investing activities (35,747) (33,553) (52,520)
Cash flows from financing activities      
Proceeds from initial public offering, net of underwriting discounts and commissions 90,562 0 0
Payments of offering costs (3,950) 0 0
Proceeds from issuance of common stock, net of issuance costs 0 10,078 0
Proceeds from exercise of stock options 9,345 8,906 3,670
Payments for purchase of treasury stock (911) (10,016) (145)
Proceeds from borrowings, net of borrowing costs 69,748 14,987 89,844
Repayments of borrowings (70,000) 0 (85,400)
Payments for debt extinguishment costs (420) 0 0
Net cash provided by financing activities 94,374 23,955 7,969
Effect of exchange rate changes on cash and cash equivalents 1,138 1,320 (182)
Net increase (decrease) in cash and cash equivalents 90,335 55,682 (1,439)
Cash and cash equivalents      
Beginning of period 130,595 74,913 76,352
End of period 220,930 130,595 74,913
Supplemental disclosure      
Cash paid for interest 3,750 4,114 2,326
Cash paid for taxes, net of refunds 1,430 461 233
Supplemental disclosure of non-cash investing and financing activities      
Conversion of redeemable convertible preferred stock to common stock 90,341 0 0
Purchases of property and equipment, accrued but not paid $ 4,075 $ 9,665 $ 3,939
Net exercise of Series C preferred stock warrants 0 0 1,704
Deferred offering costs in accounts payable and accrued expenses $ 585 $ 0 $ 0