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Cash Flow Information (Tables) | 12 Months Ended
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Apr. 27, 2013
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 27, 2013 |  | April 28, 2012 |  | April 30, 2011
(Increase) decrease: |  |  |  |  |
Restricted cash | $ | 1,120 |  |  | $ | 377 |  |  | $ | (282 | )
Accounts receivable | 3,364 |  |  | (4,995 | ) |  | (16,837 | )
Long-term receivables | 2,348 |  |  | 462 |  |  | (756 | )
Inventories | 6,656 |  |  | (7,539 | ) |  | (10,341 | )
Costs and estimated earnings in excess of billings | (16,335 | ) |  | 1,173 |  |  | 1,040 |
Prepaid expenses and other current assets | (658 | ) |  | 784 |  |  | 82 |
Income taxes receivable | 5,944 |  |  | (1,120 | ) |  | 2,574 |
Advertising rights and other assets | 386 |  |  | 226 |  |  | 823 |
Increase (decrease): |  |  |  |  |  |  |  |
Accounts payable and accrued expenses | 7,658 |  |  | 6,975 |  |  | 11,242 |
Customer deposits | (450 | ) |  | 1,538 |  |  | 1,940 |
Billings in excess of costs and estimated earnings | (140 | ) |  | (5,899 | ) |  | 7,179 |
Long-term warranty obligations | 2,932 |  |  | (767 | ) |  | 4,561 |
Income taxes payable | 1,023 |  |  | (215 | ) |  | 853 |
Long-term deferred revenue | (576 | ) |  | 783 |  |  | 1,256 |
Other long-term obligations | (169 | ) |  | (915 | ) |  | 41 |
| $ | 13,103 |  |  | $ | (9,132 | ) |  | $ | 3,375 |
Schedule of Supplemental Cash Flow Information | Supplemental disclosures of cash flow information consisted of the following:
| Year Ended
| April 27, 2013 |  | April 28, 2012 |  | April 30, 2011
Cash payments for: |  |  |  |  |
Interest | $ | 420 |  |  | $ | 306 |  |  | $ | 113 |
Income taxes, net of refunds | 5,422 |  |  | 4,292 |  |  | (3,683 | )
Schedule of Non-Cash Investing and Financing Activities | Supplemental schedule of non-cash investing and financing activities consisted of the following:
|  | Year Ended
|  | April 27, 2013 |  | April 28, 2012 |  | April 30, 2011
Demonstration equipment transferred to inventory |  | $ | 612 |  |  | $ | 409 |  |  | $ | 896 |
Purchases of property and equipment included in accounts payable |  | 1,207 |  |  | 1,475 |  |  | 673 |
Contributions of common stock under the employee stock purchase plan |  | 1,482 |  |  | 1,413 |  |  | 1,382 |

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- Definition Tabular disclosure of the net increase (decrease) in operating capital in the operating section of the statement of cash flows, represents the entire footnote disclosure that provides details regarding the net change during the reporting period of all assets and liabilities used in operating activities. + References No definition available. + Details
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- Definition Tabular disclosure of supplemental cash flow information for the periods presented. + References No definition available. + Details
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- Definition Tabular disclosure of all or some of the information related to other significant noncash investing and financing activities that occurred during the accounting period and are not otherwise listed in the existing taxonomy. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of a transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 32 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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