Cash Flow Information - Change in Operating Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Apr. 27, 2013	Apr. 28, 2012	Apr. 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
Change in operating assets and liabilities	$ 13,103	$ (9,132)	$ 3,375

Increase (Decrease) in Advertising Rights and Other Assets

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- Definition

Increase (Decrease) in Costs in Excess of Billings

+ References

No definition available.

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- Definition

Increase (Decrease) In Long-Term Warranty Obligation

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No definition available.

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- Definition

The increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Reference 2: 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=6943989&loc=d3e3602-108585

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- Definition

The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

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- Definition

The increase (decrease) during the period in the amount due for taxes based on the reporting entity's earnings or attributable to the entity's income earning process (business presence) within a given jurisdiction.

+ References

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- Definition

The increase (decrease) during the reporting period in the liability reflecting cash payments received before the related costs have been incurred.

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- Definition

The increase (decrease) during the period in the amount of customer money held in customer accounts, including security deposits, collateral for a current or future transactions, initial payment of the cost of acquisition or for the right to enter into a contract or agreement.

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- Definition

The increase (decrease) during the reporting period, excluding the portion taken into income, in the liability reflecting revenue yet to be earned for which cash or other forms of consideration was received or recorded as a receivable.

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- Definition

The increase (decrease) during the reporting period in income taxes receivable, which represents the amount due from tax authorities for refunds of overpayments or recoveries of income taxes paid.

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- Definition

The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.

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The increase (decrease) during the reporting period in the amount due within one year (or one business cycle) of receivables that were originally due beyond one year (or one business cycle).

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- Definition

The increase (decrease) during the reporting period in other assets used in operating activities less other operating liabilities used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current assets and liabilities, other noncurrent assets and liabilities, or a combination of other current and noncurrent assets and liabilities.

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The increase (decrease) during the reporting period in other liabilities used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current liabilities, other noncurrent liabilities, or a combination of other current and noncurrent liabilities.

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- Definition

The increase (decrease) during the reporting period in the value of prepaid expenses and other assets not separately disclosed in the statement of cash flows, for example, deferred expenses, intangible assets, or income taxes.

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- Definition

The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as operating activities. This may include cash restricted for regulatory purposes.

+ 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=6943989&loc=d3e3602-108585

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