Property and Equipment (Tables)

9 Months Ended

Jun. 30, 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)	June 30, 2014			September 30, 2013
Drilling vessels and equipment	$	3,552,698		$	2,979,503
Construction work in progress	535,372			715,320
Drill pipe	27,477			26,743
Office equipment and other	35,747			24,439
Cost	4,151,294			3,746,005
Less: Accumulated depreciation	(565,245		)	(581,281		)
Drilling and other property and equipment, net	$	3,586,049		$	3,164,724