CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018
Cash flows from operating activities
Net loss	$ (20,115)	$ (4,766)	$ (15,604)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	36,426	36,415	39,358
Impairment and abandonment charges	14,174	0	0
Stock-based compensation expense	57,610	46,575	38,645
Other	5,710	2,713	1,676
Deferred income taxes	(567)	(268)	152
Foreign currency transaction (gain) loss	(4,143)	4,035	941
Changes in operating assets and liabilities:
Accounts receivable, net	49,593	(32,078)	(26,505)
Inventories	38,010	(31,796)	(80,107)
Other assets	(5,749)	(7,605)	(2,140)
Accounts payable and accrued expenses	(24,440)	85,878	66,473
Accrued compensation	1,088	8,231	1,625
Deferred revenue	4,754	6,165	5,566
Other liabilities	9,635	7,137	490
Net cash provided by operating activities	161,986	120,636	30,570
Cash flows from investing activities
Purchases of property and equipment and intangible assets	(33,035)	(23,222)	(35,747)
Cash paid for acquisition, net of acquired cash	(36,289)	0	0
Net cash used in investing activities	(69,324)	(23,222)	(35,747)
Cash flows from financing activities
Proceeds from initial public offering, net of underwriting discounts and commissions	0	0	90,562
Payments of offering costs	0	(585)	(3,950)
Proceeds from exercise of stock options	42,286	31,574	9,345
Payments for repurchase of common stock	(50,015)	(2,426)	(911)
Payments for repurchase of common stock related to shares withheld for tax in connection with vesting of RSUs	(11,029)	0	0
Proceeds from borrowings, net of borrowing costs	0	0	69,748
Repayments of borrowings	(8,333)	(6,667)	(70,000)
Payments for debt extinguishment costs	0	0	(420)
Net cash provided by (used in) financing activities	(27,091)	21,896	94,374
Effect of exchange rate changes on cash, cash equivalents and restricted cash	2,900	(1,610)	1,135
Net increase in cash, cash equivalents, and restricted cash	68,471	117,700	90,332
Cash, cash equivalents, and restricted cash
Beginning of period	338,820	221,120	130,788
End of period	407,291	338,820	221,120
Supplemental disclosure
Cash paid for interest	1,647	2,517	3,750
Cash paid for taxes, net of refunds	783	3,570	1,430
Cash paid for amounts included in the measurement of lease liabilities	17,194	0	0
Supplemental disclosure of non-cash investing and financing activities
Conversion of redeemable convertible preferred stock to common stock	0	0	90,341
Purchases of property and equipment, accrued but not paid	3,911	11,687	4,075
Right-of-use assets obtained in exchange for lease liabilities	77,416	0	0
Deferred offering costs in accounts payable and accrued expenses	$ 0	$ 0	$ 585