Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Oct. 28, 2017	Oct. 29, 2016
Cash flows from operating activities
Net income (loss)	$ (1,497)	$ 16,307
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation of property, plant, and equipment	14,992	14,542
Impairment charges	5,852	2,214
Provision for doubtful accounts	138	330
Stock-based compensation	2,522	3,111
Deferred income taxes	7	1,187
Cash gain on investments	154	0
Other non-cash charges (gain), net	38	(78)
Changes in assets and liabilities:
Accounts receivable	(4,205)	(6,808)
Inventories	2,162	17,844
Prepaid expenses and other assets	670	(2,326)
Accounts payable	(11,085)	(5,381)
Income taxes	84	(11,707)
Accrued and other liabilities	(2,341)	(2,741)
Net cash provided by operating activities	7,491	26,494
Cash flows from investing activities
Purchases of property, plant, and equipment	(8,923)	(17,430)
Purchases of investments	(44,412)	(30,000)
Proceeds from maturities and sales of investments	37,600	0
Proceeds from disposal of property, plant, and equipment	0	8
Net cash used in investing activities	(15,735)	(47,422)
Cash flows from financing activities
Tax withholdings for equity compensation	(610)	(647)
Repurchase of common stock	(6,126)	(23,210)
Payments of debt-issuance costs	(113)	0
Other financing activities, net	0	(27)
Net cash used in financing activities	(6,849)	(23,884)
Effect of exchange rate changes on cash and cash equivalents	(10)	(5)
Net decrease in cash and cash equivalents	(15,103)	(44,817)
Cash and cash equivalents, beginning of period	86,375	97,681
Cash and cash equivalents, end of period	71,272	52,864
Supplemental disclosure of cash flow information
Cash paid for income taxes, net	$ 852	$ 19,458