Property and Equipment (Tables)

3 Months Ended

Dec. 31, 2015

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)	December 31, 2015			September 30, 2015
Drilling vessels and equipment	$	3,933,767		$	4,003,483
Construction work in progress	791,232			720,852
Drill pipe	54,861			55,248
Office equipment and other	39,033			36,379
Total cost	4,818,893			4,815,962
Less: Accumulated depreciation	(610,802		)	(643,830		)
Property and equipment, net	$	4,208,091		$	4,172,132