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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Aug. 01, 2020
Jul. 27, 2019
Operating activities    
Net income $ 10,043 $ 17,099
Adjustments to reconcile net income from continuing operations to cash provided by operating activities from continuing operations:    
Depreciation and amortization 2,779 2,079
Losses from equity method investments 1,288 1,347
Realized gain from sale of available-for-sale investments (11)  
Provision for doubtful accounts (136) 11
Other non-cash expense   32
Non-cash lease expense (income) 1,190 (251)
Loss on foreign currency transactions 1 1
Deferred income taxes (339) (349)
Stock-based compensation 1,595 1,566
Loss (gain) on sale of property and equipment 2 (75)
Amortization of debt securities (43) (527)
Changes in operating assets and liabilities, net of acquisitions:    
Accounts receivable 30,439 (11,557)
Unbilled receivables and retentions 2,046 5,112
Inventories 5 (1,946)
Income tax receivable   821
Prepaid expenses and other assets 324 (616)
Accounts payable (7,338) (5,110)
Other liabilities (15,004) (4,524)
Net cash provided by operating activities 26,841 3,113
Investing activities    
Acquisition of property and equipment (4,067) (1,902)
Equity method investments (1,173) (4,569)
Business acquisition, net of cash acquired   (18,641)
Proceeds from sale of property and equipment   81
Redemptions of held-to-maturity investments   65,035
Purchases of held-to-maturity investments   (70,463)
Redemptions of available-for-sale investments 41,727  
Purchases of available-for-sale investments (69,961) (2,693)
Net cash provided by (used in) investing activities (33,474) (33,152)
Financing activities    
Tax withholding payment related to net settlement of equity awards (1,756) (668)
Exercise of stock options 86 93
Net cash used in financing activities from continuing operations (1,670) (575)
Net increase in cash, cash equivalents, and restricted cash (8,303) (30,614)
Cash, cash equivalents, and restricted cash at beginning of period 255,142 172,708
Cash, cash equivalents, and restricted cash at end of period 246,839 142,094
Cash refunded (paid), net during the period for:    
Income taxes 10 (294)
Non-cash activities    
Unrealized loss on investments, net of deferred tax expense of $4 for the three months ended August 1, 2020 52  
Change in foreign currency translation adjustments 75 169
Acquisitions of property and equipment included in accounts payable $ 643 $ 1,253