Cash Flow Information - Change in Operating Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
May. 02, 2015	Apr. 26, 2014	Apr. 27, 2013
(Increase) decrease:
Restricted cash	$ 18	$ (466)	$ 1,120
Accounts receivable	6,412	(18,293)	3,364
Long-term receivables	3,234	3,027	2,348
Inventories	(1,907)	(12,771)	6,656
Costs and estimated earnings in excess of billings	(1,667)	5,955	(16,335)
Prepaid expenses and other current assets	(575)	(536)	(658)
Income taxes receivable	(3,084)	(2,414)	5,944
Advertising rights and other assets	912	64	386
Increase (decrease):
Current marketing obligations and other payables	(146)	372	3
Accounts Payable	5,594	6,701	4,749
Customer deposits	(1,315)	4,931	(450)
Accrued Liabilities	2,860	165	2,909
Short-term warranty obligation	(2,638)	543	884
Billings in excess of costs and estimated earnings	1,314	8,238	(140)
Long-term warranty obligations	1,869	1,560	2,048
Income taxes payable	(666)	(527)	1,023
Long-term deferred revenue	(250)	(836)	(577)
Other long-term obligations	3,468	(501)	(171)
Change in operating assets and liabilities	$ 13,433	$ (4,788)	$ 13,103

Increase (Decrease) in Advertising Rights and Other Assets

No definition available.

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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

+ References

No definition available.

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- Definition

Increase (Decrease) In Short-Term Warranty Obligation

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No definition available.

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- Definition

Increase (decrease) in Current marketing obligations and other payables

+ References

No definition available.

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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=31042434&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.

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- Definition

The increase (decrease) during the reporting period in the aggregate amount of expenses incurred but not yet paid.

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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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- Definition

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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No definition available.

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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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- Definition

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.

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