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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 30, 2017
Cash flows from operating activities      
Net loss $ (4,766) $ (15,604) $ (14,217)
Adjustments to reconcile net loss to net cash provided by operating activities:      
Depreciation 36,415 39,358 35,014
Stock-based compensation expense 46,575 38,645 36,550
Other 2,713 1,676 713
Deferred income taxes (268) 152 1,443
Foreign currency transaction (gain) loss 4,035 941 (3,568)
Changes in operating assets and liabilities:      
Accounts receivable, net (32,078) (26,505) (2,727)
Inventories, net (31,796) (80,107) (60,270)
Other assets (7,605) (2,140) 36
Accounts payable and accrued expenses 85,878 66,473 54,895
Accrued compensation 8,231 1,625 5,123
Deferred revenue 6,165 5,566 9,411
Other liabilities 7,137 490 1,557
Net cash provided by operating activities 120,636 30,570 63,960
Cash flows from investing activities      
Purchases of property and equipment (23,222) (35,747) (33,553)
Net cash used in investing activities (23,222) (35,747) (33,553)
Cash flows from financing activities      
Proceeds from initial public offering, net of underwriting discounts and commissions 0 90,562 0
Payments of offering costs (585) (3,950) 0
Proceeds from issuance of common stock, net of issuance costs 0 0 10,078
Proceeds from exercise of stock options 31,574 9,345 8,906
Payments for purchase of treasury stock (2,426) (911) (10,016)
Proceeds from borrowings, net of borrowing costs 0 69,748 14,987
Repayments of borrowings (6,667) (70,000) 0
Payments for debt extinguishment costs 0 (420) 0
Net cash provided by financing activities 21,896 94,374 23,955
Effect of exchange rate changes on cash, cash equivalents and restricted cash (1,610) 1,135 1,329
Net increase in cash, cash equivalents, and restricted cash 117,700 90,332 55,691
Cash, cash equivalents, and restricted cash      
Beginning of period 221,120 130,788 75,097
End of period 338,820 221,120 130,788
Supplemental disclosure      
Cash paid for interest 2,517 3,750 4,114
Cash paid for taxes, net of refunds 3,570 1,430 461
Supplemental disclosure of non-cash investing and financing activities      
Conversion of redeemable convertible preferred stock to common stock 0 90,341 0
Purchases of property and equipment, accrued but not paid 11,687 4,075 9,665
Deferred offering costs in accounts payable and accrued expenses $ 0 $ 585 $ 0