CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Oct. 28, 2017	Oct. 29, 2016
Operating activities
Net income (loss)	$ 2,346	$ (15,814)
Adjustments to reconcile net income (loss) to cash provided by (used in) operating activities:
Depreciation and amortization	3,692	3,401
Loss from equity method investments		111
Impairment of long-lived assets	255
Impairment of intangible assets and goodwill	1,021
Provision for doubtful accounts	943	119
(Gains) losses on foreign currency transactions	(108)	269
Deferred income taxes	(1,093)	(329)
Stock-based compensation	2,608	1,813
Tax benefit from exercise of stock options		22
Loss (Gain) on disposition of property and equipment	15	(7)
Amortization of held-to-maturity investments	897	1,259
Changes in operating assets and liabilities:
Accounts receivable	38,440	29,562
Unbilled receivables and retentions	626	2,029
Inventories	(15,963)	(17,682)
Income tax receivable		(3,957)
Prepaid expenses and other assets	468	(555)
Accounts payable	(4,739)	1,413
Other liabilities	(5,289)	(7,933)
Net cash provided by (used in) operating activities	24,119	(6,279)
Investing activities
Acquisition of property and equipment	(6,037)	(4,514)
Redemptions of held-to-maturity investments	105,758	53,961
Purchases of held-to-maturity investments	(88,763)	(79,052)
Proceeds from the sale of property and equipment		7
Sales and redemptions of available-for-sale investments	450	400
Net cash provided by (used in) investing activities	11,408	(29,198)
Financing activities
Principal payments of capital lease obligations	(173)	(192)
Tax withholding payment related to net settlement of equity awards	(313)
Exercise of stock options	2,164	258
Net cash provided by financing activities	1,678	66
Net increase (decrease) in cash and cash equivalents	37,205	(35,411)
Cash and cash equivalents at beginning of period	79,904	124,287
Cash and cash equivalents at end of period	117,109	88,876
Cash paid during the period for:
Income taxes	1,803	1,786
Non-cash activities
Unrealized gain on investments, net of deferred tax expense of $19 and $29, respectively	29	43
Reclassification from share-based liability compensation to equity	384	307
Acquisitions of property and equipment included in accounts payable	$ 888	$ 704