CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Oct. 27, 2018	Oct. 28, 2017
Operating activities
Net income	$ 33,366	$ 1,635
Gain on sale of business, net of tax expense	(8,452)
Loss from discontinued operations, net of tax	2,449	1,521
Net income from continuing operations	27,363	3,156
Adjustments to reconcile net income to cash provided by operating activities
Depreciation and amortization	3,584	2,784
Loss from equity method investments	1,354
Impairment of long-lived assets		255
Provision for doubtful accounts	(27)	935
Impairment of intangible assets and goodwill		1,021
Gains on foreign currency transactions	(13)	(108)
Deferred income taxes	(614)	(1,094)
Stock-based compensation	2,517	2,535
Loss on disposition of property and equipment		15
Amortization of held-to-maturity investments	(459)	897
Changes in operating assets and liabilities:
Accounts receivable	22,261	39,861
Unbilled receivables and retentions	(28,782)	600
Inventories	(8,671)	(13,772)
Income tax receivable		(307)
Prepaid expenses and other assets	(831)	413
Accounts payable	(8,841)	(2,972)
Other liabilities	(6,184)	(4,225)
Net cash provided by operating activities of continuing operations	2,657	29,994
Investing activities
Acquisition of property and equipment	(4,135)	(5,455)
Proceeds from sale of business	31,994
Redemptions of held-to-maturity investments	153,029	105,758
Purchases of held-to-maturity investments	(169,402)	(88,763)
Redemptions of available-for-sale investments	2,250	450
Net cash used in investing activities from continuing operations	13,736	11,990
Financing activities
Principal payments of capital lease obligations	(111)	(173)
Tax withholding payment related to net settlement of equity awards	(975)	(313)
Exercise of stock options	71	2,164
Net cash (used in) provided by financing activities from continuing operations	(1,015)	1,678
Discontinued operations
Operating activities of discontinued operations	(7,188)	(5,875)
Investing activities of discontinued operations	(452)	(582)
Net cash used in discontinued operations	(7,640)	(6,457)
Net increase in cash and cash equivalents	7,738	37,205
Cash and cash equivalents at beginning of period	143,517	79,904
Cash and cash equivalents at end of period	151,255	117,109
Cash (refunds) paid, net during the period for:
Income tax refund	5,270	1,803
Non-cash activities
Unrealized gain on investments, net of deferred tax expense of $51 and $19, respectively	57	29
Reclassification from share-based liability compensation to equity		384
Change in foreign currency translation adjustments	(31)
Acquisitions of property and equipment included in accounts payable	$ 753	$ 888