CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017
Cash flows from operating activities
Net income (loss)	$ (13,884)	$ 688
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	28,647	24,447
Stock-based compensation expense	29,397	26,961
Other	639	493
Deferred income taxes	117	1,593
Foreign currency transaction (gain) loss	301	(2,499)
Changes in operating assets and liabilities:
Accounts receivable, net	(5,659)	(6,973)
Inventories, net	(79)	14,202
Other assets	(4,901)	335
Accounts payable and accrued expenses	(24,357)	(20,702)
Accrued compensation	(4,237)	554
Deferred revenue	10,342	6,636
Other liabilities	(534)	181
Net cash provided by operating activities	15,792	45,916
Cash flows from investing activities
Purchases of property and equipment	(25,927)	(21,073)
Net cash used in investing activities	(25,927)	(21,073)
Cash flows from financing activities
Proceeds from credit facilities and issuance of debt, net of issuance costs	30,000	14,987
Payments of principal on credit facilities	(30,000)	0
Proceeds from issuance of common stock, net of issuance costs	0	10,078
Repurchase of common stock	(911)	(10,016)
Proceeds from exercise of common stock options	5,748	5,421
Payments of offering costs	(2,154)	0
Net cash provided by financing activities	2,683	20,470
Effect of exchange rate changes on cash and cash equivalents	1,289	955
Net increase (decrease) in cash and cash equivalents	(6,163)	46,268
Cash and cash equivalents
Beginning of period	130,595	74,913
End of period	124,432	121,181
Supplemental disclosure
Cash paid for interest	3,596	3,006
Cash paid for taxes, net of refunds	1,251	268
Supplemental disclosure of non-cash investing and financing activities
Purchases of property and equipment in accounts payable and accrued expenses	7,187	10,732
Deferred offering costs in accounts payable and accrued expenses	$ 972	$ 0