Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jan. 25, 2020	Jan. 26, 2019
Operating activities
Net income	$ 23,576	$ 41,716
Gain on sale of business, net of tax		(8,452)
Loss from discontinued operations, net of tax		2,511
Net income from continuing operations	23,576	35,775
Adjustments to reconcile net income from continuing operations to cash provided by operating activities from continuing operations:
Depreciation and amortization	7,107	5,530
Loss from equity method investment	3,410	2,071
Provision for doubtful accounts	(2)	(33)
Other non-cash gain, net	(719)
Non-cash lease expense	3,453
Gains on foreign currency transactions		(10)
Deferred income taxes	(946)	(1,214)
Stock-based compensation	4,751	5,599
(Gain) loss on sale of property and equipment	(71)	51
Amortization of debt securities	(1,291)	(941)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	3,245	22,817
Unbilled receivables and retentions	(24,364)	(34,760)
Inventories	(10,766)	(12,954)
Income tax receivable	821
Prepaid expenses and other assets	216	(1,791)
Accounts payable	(1,301)	(10,645)
Other liabilities	7,947	(2,598)
Net cash provided by operating activities of continuing operations	15,066	6,897
Investing activities
Acquisition of property and equipment	(8,504)	(6,806)
Equity method investments	(9,551)
Business acquisition, net of cash acquired	(18,641)
Proceeds from sale of business		31,994
Proceeds from sale of property and equipment	81
Redemptions of held-to-maturity investments	166,917	191,455
Purchases of held-to-maturity investments	(162,517)	(211,120)
Redemptions of available-for-sale investments	41,150	2,250
Purchases of available-for-sale investments	(59,297)
Net cash (used in) provided by investing activities from continuing operations	(50,362)	7,773
Financing activities
Principal payments of capital lease obligations		(154)
Tax withholding payment related to net settlement of equity awards	(1,009)	(1,033)
Exercise of stock options	93	71
Net cash used in financing activities from continuing operations	(916)	(1,116)
Discontinued operations
Operating activities of discontinued operations	0	(7,250)
Investing activities of discontinued operations	0	(452)
Net cash used in discontinued operations		(7,702)
Net (decrease) increase in cash, cash equivalents, and restricted cash	(36,212)	5,852
Cash, cash equivalents, and restricted cash at beginning of period	172,708	143,517
Cash, cash equivalents, and restricted cash at end of period	136,496	149,369
Cash paid, net during the period for:
Income taxes	518	6,777
Non-cash activities
Unrealized gain on investments, net of deferred tax expense of $51		57
Change in foreign currency translation adjustments	67	(32)
Acquisitions of property and equipment included in accounts payable	$ 263	$ 58