Property, Equipment and Improvements (Details) (USD $) In Thousands, unless otherwise specified	Oct. 30, 2011	Apr. 30, 2011
Property, Plant and Equipment [Line Items]
Total	$ 361,057	$ 327,051
Accumulated depreciation and amortization	(217,918)	(201,358)
Property, equipment and improvements (net)	143,139	125,693
Land [Member]
Property, Plant and Equipment [Line Items]
Total	273	0
Building [Member]
Property, Plant and Equipment [Line Items]
Total	9,104	9,733
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Total	45,250	42,888
Office Equipment, Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total	4,315	4,163
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total	279,321	248,641
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total	$ 22,794	$ 21,626

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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- Definition

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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