CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Jun. 29, 2019	Jun. 30, 2018
Cash flows from operating activities
Net income (loss)	$ 24,834	$ (13,884)
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Depreciation	27,403	28,647
Stock-based compensation expense	33,525	29,397
Other	1,962	639
Deferred income taxes	(129)	117
Foreign currency transaction loss	1,430	301
Changes in operating assets and liabilities:
Accounts receivable, net	(19,114)	(5,659)
Inventories, net	69,683	(79)
Other assets	(5,434)	(4,901)
Accounts payable and accrued expenses	(33,680)	(24,357)
Accrued compensation	1,091	(4,237)
Deferred revenue	5,279	10,342
Other liabilities	4,086	(534)
Net cash provided by operating activities	110,936	15,792
Cash flows from investing activities
Purchases of property and equipment	(14,092)	(25,927)
Net cash used in investing activities	(14,092)	(25,927)
Cash flows from financing activities
Proceeds from borrowings, net of borrowing costs	0	30,000
Repayments of borrowings	0	(30,000)
Payments for purchase of treasury stock	(832)	(911)
Proceeds from exercise of common stock options	22,034	5,748
Payments of offering costs	(585)	(2,154)
Net cash provided by financing activities	20,617	2,683
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(103)	1,289
Net increase (decrease) in cash, cash equivalents and restricted cash	117,358	(6,163)
Cash, cash equivalents and restricted cash
Beginning of period	221,120	130,788
End of period	338,478	124,625
Supplemental disclosure
Cash paid for interest	1,334	3,596
Cash paid for taxes, net of refunds	2,534	1,251
Supplemental disclosure of non-cash investing and financing activities
Purchases of property and equipment in accounts payable and accrued expenses	6,053	7,187
Deferred offering costs in accounts payable and accrued expenses	$ 0	$ 972