Property and Equipment (Tables)

6 Months Ended

Mar. 31, 2014

Property, Plant and Equipment [Abstract]

Summary of Property and Equipment by Classification

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

(In thousands)	March 31, 2014			September 30, 2013
Drilling vessels and equipment	$	3,591,053		$	2,979,503
Construction work in progress	511,851			715,320
Drill pipe	28,799			26,743
Office equipment and other	34,222			24,439
Cost	4,165,925			3,746,005
Less: Accumulated depreciation	(590,753		)	(581,281		)
Drilling and other property and equipment, net	$	3,575,172		$	3,164,724