CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Jul. 27, 2019	Jul. 28, 2018
Operating activities
Net income	$ 17,099	$ 27,316
Gain on sale of business, net of tax		(8,843)
Loss from discontinued operations		1,850
Net income from continuing operations	17,099	20,323
Adjustments to reconcile net income to cash provided by (used in) operating activities:
Depreciation and amortization	2,079	1,746
Loss from equity method investments	1,347	602
Provision for doubtful accounts	11	(48)
Other non-cash expense	32
Non-cash lease expense	(251)
Losses (gains) on foreign currency transactions	1	(2)
Deferred income taxes	(349)	(306)
Stock-based compensation	1,566	1,287
Gain on sale of property and equipment	(75)
Amortization of held-to-maturity investments	(527)	(115)
Changes in operating assets and liabilities:
Accounts receivable	(11,557)	43,189
Unbilled receivables and retentions	5,112	(42,998)
Inventories	(1,946)	(4,819)
Income tax receivable	821
Prepaid expenses and other assets	(616)	(133)
Accounts payable	(5,110)	(9,893)
Other liabilities	(4,524)	(3,797)
Net cash provided by operating activities of continuing operations	3,113	5,036
Investing activities
Acquisition of property and equipment	(1,902)	(1,423)
Equity method investments	(4,569)
Business acquisition, net of cash acquired	(18,641)
Proceeds from sale of business		31,994
Proceeds from the sale of property and equipment	81
Redemptions of held-to-maturity investments	65,035	78,909
Purchases of held-to-maturity investments	(70,463)	(81,646)
Redemptions of available-for-sale investments		2,250
Purchases of available-for-sale investments	(2,693)
Net cash (used in) provided by investing activities from continuing operations	(33,152)	30,084
Financing activities
Principal payments of capital lease obligations		(57)
Tax withholding payment related to net settlement of equity awards	(668)	(819)
Exercise of stock options	93	67
Net cash provided by financing activities from continuing operations	(575)	(809)
Discontinued operations
Operating activities of discontinued operations	0	(6,609)
Investing activities of discontinued operations	0	(431)
Financing activities of discontinued operations	0	0
Net cash used in discontinued operations		(7,040)
Net (decrease) increase in cash, cash equivalents, and restricted cash	(30,614)	27,271
Cash, cash equivalents, and restricted cash at beginning of period	172,708	143,517
Cash, cash equivalents, and restricted cash at end of period	142,094	170,788
Cash paid, net during the period for:
Income taxes	294	(7)
Non-cash activities
Unrealized gain on investments, net of deferred tax expense of $51 for the three months ended July 28, 2018		57
Change in foreign currency translation adjustments	169	(20)
Acquisitions of property and equipment included in accounts payable	$ 1,253	$ 595