Property and Equipment (Tables)

9 Months Ended

Jun. 30, 2013

Property, Plant and Equipment [Abstract]

A Summary of Property and Equipment by Classification

A summary of property and equipment by classification is as follows:

(In thousands)	June 30, 2013			September 30, 2012
Drilling vessels and equipment	$	2,968,358		$	2,523,895
Construction work in progress	573,010			438,081
Drill pipe	21,439			20,576
Office equipment and other	23,007			19,610
Cost	3,585,814			3,002,162
Less: Accumulated depreciation	(550,242		)	(464,822		)
Drilling and other property and equipment, net	$	3,035,572		$	2,537,340