CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Jul. 30, 2016	Aug. 01, 2015
Operating activities
Net loss	$ (11,642)	$ (6,981)
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation and amortization	1,653	1,402
Loss from equity method investments	72	65
Impairment of available-for-sale securities		2,186
Provision for doubtful accounts	171	(147)
Losses on foreign currency transactions	226	58
Loss on sale of equity securities		145
Deferred income taxes		203
Stock-based compensation	992	1,039
Tax benefit from exercise of stock options	22	196
Excess tax benefit from stock-based compensation		(95)
Gain on disposition of property and equipment	(7)
Amortization of held-to-maturity investments	661	1,149
Changes in operating assets and liabilities:
Accounts receivable	23,019	5,549
Unbilled receivables and retentions	4,406	3,358
Inventories	(6,619)	(4,507)
Income tax receivable	(4,250)	(5,569)
Prepaid expenses and other assets	(17)	710
Accounts payable	(6,336)	(6,299)
Other liabilities	(3,594)	(3,766)
Net cash used in operating activities	(1,243)	(11,304)
Investing activities
Acquisition of property and equipment	(2,634)	(906)
Equity method investment		(85)
Redemptions of held-to-maturity investments	28,820	37,507
Purchases of held-to-maturity investments	(27,487)	(22,970)
Proceeds from the sale of property and equipment	7
Sales and redemptions of available-for-sale investments	400	217
Net cash (used in) provided by investing activities	(894)	13,763
Financing activities
Excess tax benefit from stock-based compensation		95
Principal payments of capital lease obligations	(95)
Tax withholding payment related to net settlement of equity awards		(29)
Exercise of stock options	258	515
Net cash provided by financing activities	163	581
Net (decrease) increase in cash and cash equivalents	(1,974)	3,040
Cash and cash equivalents at beginning of period	124,287	143,410
Cash and cash equivalents at end of period	122,313	146,450
Cash paid during the period for:
Income taxes	1,786	1,519
Non-cash activities
Unrealized change in fair value of long-term investments recorded in accumulated other comprehensive loss, net of deferred tax expense of $12 and $1, respectively	18	2
Reclassification from share-based liability compensation to equity	307	$ 228
Acquisitions of property and equipment included in accounts payable	$ 321