Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Apr. 29, 2017	Apr. 30, 2016
Cash flows from operating activities
Net (loss) income	$ (4,049)	$ 2,418
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Depreciation of property, plant, and equipment	4,948	4,702
Provision for doubtful accounts	162	23
Stock-based compensation	1,278	842
Deferred income taxes	867	221
Cash gain on investments	152	0
Other non-cash gain, net	(19)	(13)
Changes in assets and liabilities:
Accounts receivable	458	3,580
Inventories	(3,138)	178
Prepaid expenses and other assets	(748)	(1,749)
Accounts payable	(6,040)	1,262
Income taxes	(2,332)	(12,066)
Accrued and other liabilities	(1,476)	(3,395)
Net cash used in operating activities	(9,937)	(3,997)
Cash flows from investing activities
Purchases of property, plant, and equipment	(3,362)	(5,594)
Purchases of investments	(26,975)	(30,000)
Proceeds from maturity of investment	30,000	0
Net cash used in investing activities	(337)	(35,594)
Cash flows from financing activities
Tax withholdings for equity compensation	(579)	(572)
Repurchase of common stock	(1,116)	(5,694)
Other financing activities, net	0	(16)
Net cash used in financing activities	(1,695)	(6,282)
Effect of exchange rate changes on cash and cash equivalents	(6)	5
Net decrease in cash and cash equivalents	(11,975)	(45,868)
Cash and cash equivalents, beginning of period	86,375	97,681
Cash and cash equivalents, end of period	74,400	51,813
Supplemental disclosure of cash flow information
Cash paid for income taxes, net	$ 522	$ 13,223