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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Jul. 31, 2021
Aug. 01, 2020
Operating activities    
Net (loss) income $ (13,918) $ 10,043
Net (loss) income (13,918) 10,043
Adjustments to reconcile net (loss) income to cash provided by operating activities:    
Depreciation and amortization 13,654 2,779
Losses from equity method investments, net 1,141 1,288
Amortization of debt issuance costs 129  
Realized gain from sale of available-for-sale investments   (11)
Provision for doubtful accounts (20) (136)
Other non-cash expense 48  
Non-cash lease expense 1,677 1,190
(Gain) loss on foreign currency transactions 19 1
Deferred income taxes (472) (339)
Stock-based compensation 1,922 1,595
Loss on sale of property and equipment 379 2
Amortization of debt securities 90 (43)
Changes in operating assets and liabilities, net of acquisitions:    
Accounts receivable 17,914 30,439
Unbilled receivables and retentions (14,684) 2,046
Inventories (6,058) 5
Income taxes receivable (326)  
Prepaid expenses and other assets 481 324
Accounts payable (7,997) (7,338)
Other liabilities (9,283) (15,004)
Net cash (used in) provided by operating activities (15,304) 26,841
Investing activities    
Acquisition of property and equipment (5,428) (4,067)
Equity method investments (2,692) (1,173)
Business acquisitions, net of cash acquired (46,150)  
Redemptions of available-for-sale investments 17,925 41,727
Purchases of available-for-sale investments   (69,961)
Net cash used in investing activities (36,345) (33,474)
Financing activities    
Principle payment of loan (2,500)  
Holdback and retention payments for business acquisition (5,991)  
Tax withholding payment related to net settlement of equity awards (1,176) (1,756)
Exercise of stock options 119 86
Other (8)  
Net cash used in financing activities (9,556) (1,670)
Effects of currency translation on cash and cash equivalents (111)  
Net decrease in cash, cash equivalents, and restricted cash (61,316) (8,303)
Cash, cash equivalents, and restricted cash at beginning of period 157,063 255,142
Cash, cash equivalents, and restricted cash at end of period 95,747 246,839
Cash paid, net during the period for:    
Income taxes   10
Non-cash activities    
Unrealized loss on available-for-sale investments, net of deferred tax benefit of $0 and $4 for the three months ended July 31, 2021 and August 1, 2020, respectively 4 52
Change in foreign currency translation adjustments (733) 75
Issuances of inventory to property and equipment, ISR in-service assets 6,881  
Acquisitions of property and equipment included in accounts payable $ 821 $ 643