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Cash Flow Information (Tables) | 12 Months Ended
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Apr. 29, 2017
Supplemental Cash Flow Information [Abstract] |
Summary of Changes in Operating Assets and Liabilities | The changes in operating assets and liabilities consisted of the following:
| Year Ended
| April 29, 2017 |  | April 30, 2016 |  | May 2, 2015
(Increase) decrease: |  |  |  |  |
Restricted cash | $ | (18 | ) |  | $ | 298 |  |  | $ | 18 |
Account receivable | (2,718 | ) |  | 3,789 |  |  | 6,412 |
Long-term receivables | 2,213 |  |  | 2,851 |  |  | 3,234 |
Inventories | 3,581 |  |  | (5,100 | ) |  | (1,907 | )
Costs and estimated earnings in excess of billings | (6,203 | ) |  | 4,867 |  |  | (1,667 | )
Prepaid expenses and other current assets | (980 | ) |  | 1,290 |  |  | (575 | )
Income taxes receivables | 4,201 |  |  | 1,061 |  |  | (3,084 | )
Investment in affiliates and other assets | (475 | ) |  | (776 | ) |  | 912 |
Increase (decrease): |  |  |  |  |  |  |  |
Current marketing obligations and other payables | 857 |  |  | 21 |  |  | (146 | )
Accounts payable | 5,544 |  |  | (9,926 | ) |  | 5,594 |
Customer deposits (billed or collected) | (1,514 | ) |  | (941 | ) |  | (1,315 | )
Accrued expenses | 2,351 |  |  | 776 |  |  | 3,128 |
Warranty obligations | (2,986 | ) |  | 4,726 |  |  | (2,638 | )
Billings in excess of costs and estimated earnings | 536 |  |  | (13,436 | ) |  | 1,314 |
Long-term warranty obligations | 389 |  |  | (710 | ) |  | 1,869 |
Income taxes payable | 1,331 |  |  | (37 | ) |  | (627 | )
Deferred revenue (billed or collected) | 1,256 |  |  | 2,120 |  |  | (250 | )
Long-term marketing obligations and other payables | (43 | ) |  | (456 | ) |  | 3,468 |
| $ | 7,322 |  |  | $ | (9,583 | ) |  | $ | 13,740 |
Schedule of Supplemental Cash Flow Information | Supplemental disclosures of cash flow information consisted of the following:
| Year Ended
| April 29, 2017 |  | April 30, 2016 |  | May 2, 2015
Cash payments for: |  |  |  |  |
Interest | $ | 228 |  |  | $ | 303 |  |  | $ | 289 |
Income taxes, net of refunds | 3,196 |  |  | (824 | ) |  | 8,690 |
Schedule of Non-Cash Investing and Financing Activities | Supplemental schedule of non-cash investing and financing activities consisted of the following:
|  | Year Ended
|  | April 29, 2017 |  | April 30, 2016 |  | May 2, 2015
Demonstration equipment transferred to inventory |  | $ | 218 |  |  | $ | 227 |  |  | $ | 34 |
Purchases of property and equipment included in accounts payable |  | 2,524 |  |  | 142 |  |  | 1,510 |
Contributions of common stock under the ESPP |  | 840 |  |  | 1,777 |  |  | 2,512 |
Contingent consideration related to acquisition of ADFLOW |  | 31 |  |  | 1,955 |  |  | — |

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