Summary Of Significant Accounting Policies (Components Of Property, Plant And Equipment) (Details) (USD $) In Thousands	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2009
Summary Of Significant Accounting Policies
Land	$ 22,578	$ 21,771
Buildings	266,482	240,787
Machinery and equipment	625,439	587,977
Construction in progress	31,375	26,223
Less accumulated depreciation	(554,372)	(510,866)
Total property, plant and equipment, net	$ 391,502	$ 365,892	$ 381,068

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, as of the balance sheet date, of long-lived, depreciable assets that include building structures held for productive use including any addition, improvement, or renovation to the structure, such as interior masonry, interior flooring, electrical, and plumbing.

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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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