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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PROPERTY AND EQUIPMENT (Property And Equipment By Classification) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Property, Plant and Equipment [Line Items]
Cost	$ 3,002,162	$ 2,342,401
Less: Accumulated depreciation	(464,822)	(455,080)
Drilling and other property and equipment, net	2,537,340	1,887,321	1,343,961
Drilling vessels equipment [Member]
Property, Plant and Equipment [Line Items]
Cost	2,523,895	1,578,592
Construction work in progress [Member]
Property, Plant and Equipment [Line Items]
Cost	438,081	736,827
Drill pipe [Member]
Property, Plant and Equipment [Line Items]
Cost	20,576	18,182
Furniture and other [Member]
Property, Plant and Equipment [Line Items]
Cost	$ 19,610	$ 8,800