Property, Plant, and Equipment, Net (Property, Plant, and Equipment - Net) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011	Sep. 30, 2011
Property, Plant, and Equipment, Net
Land	$ 14,553		$ 14,553		$ 14,823
Buildings and improvements	192,736		192,736		177,637
Leasehold improvements	20,424		20,424		18,765
Machinery and production equipment	267,334		267,334		265,898
Computer equipment and software	82,315		82,315		66,149
Other	24,525		24,525		25,191
Construction in progress	33,847		33,847		44,975
Property, plant and equipment, gross total	635,734		635,734		613,438
Less accumulated depreciation	(421,237)		(421,237)		(406,713)
Property, plant and equipment, net, total	214,497		214,497		206,725
Depreciation expense	9,513	9,970	19,682	20,324
Capitalized interest	$ 124	$ 315	$ 428	$ 513

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.

+ References

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Gross amount, at the balance sheet date, of long-lived assets under construction that include construction costs to date on capital projects that have not been completed and assets being constructed that are not ready to be placed into service.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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-Publisher FASB

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The amount of cash paid during the current period for interest that is capitalized.

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-Name Statement of Financial Accounting Standard (FAS)

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- Definition

Carrying amount as of the balance sheet date of real estate held for productive use. This excludes land held for sale.

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Gross amount, at the balance sheet date, of long-lived, depreciable assets that are an addition or improvement to assets held under lease arrangement.

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Gross amount, as of the balance sheet date, of long-lived, depreciable assets used in the production process to produce goods and services.

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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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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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- Definition

This element represents capitalized assets classified as property, plant and equipment not otherwise defined in the taxonomy.

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

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- Definition

The gross amount of long lived, depreciable assets that are used in the creation, maintenance and utilization of information systems and capitalized computer software costs as of the balance sheet date.

+ References

No definition available.

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