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Cash Flow Information - Change in Operating Assets and Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 28, 2018 | Apr. 29, 2017 | Apr. 30, 2016
(Increase) decrease: |  |  |
Accounts receivable | $ 2,266 | $ (2,718) | $ 3,789
Long-term receivables | 1,548 | 2,213 | 2,851
Inventories | (8,517) | 3,581 | (5,100)
Costs and estimated earnings in excess of billings | 5,911 | (6,203) | 4,867
Prepaid expenses and other current assets | (1,252) | (980) | 1,290
Income taxes receivable | (4,747) | 4,201 | 1,061
Investment in affiliates and other assets | (413) | 611 | 776
Increase (decrease): |  |  |
Current marketing obligations and other payables | (358) | 857 | 21
Accounts Payable | (2,573) | 5,544 | (9,926)
Customer deposits | (53) | (1,514) | (941)
Accrued expenses | 3,830 | 2,351 | 776
Warranty obligations | 346 | (2,986) | 4,726
Billings in excess of costs and estimated earnings | 1,034 | 536 | (13,436)
Long-term warranty obligations | 1,729 | 389 | (710)
Income taxes payable | (592) | 1,331 | (37)
Deferred revenue | 2,499 | 1,256 | 2,120
Long-term marketing obligations and other payables | 379 | (43) | (456)
Change in operating assets and liabilities | $ 1,863 | $ 7,204 | $ (9,881)

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- Definition The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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